Spawn enemies so they aren't instantiated on top of each other (C#)

Hello my fellow great Unites! I have an enemy spawn system that spawns out enemies using Ienumerator inside a set of borders. Now the only problem is that the enemies will sometimes spawn out on the player, or another object...

How can I fix this problem? Using a for loop?

Here's the code:

  using UnityEngine;
  using System.Collections;
  using System.Collections.Generic;
  
  public class EnemySpawn : MonoBehaviour 
  {
      // EnemyPrefabs
      public GameObject EnemyBouncingPrefab;
      public GameObject EnemyGrowerPrefab;
      public GameObject EnemyMinePrefab;
  
      //Show where spawn is prefab
      public GameObject showEnemySpawn;
      public GameObject showEnemyFlyBySpawn;
      public GameObject showEnemyGrowerSpawn;
      public GameObject showEnemyMineSpawn;
  
  
      // Array of spawn points 
      public Transform[] spawnPointsEnemyFollow; 
      public Transform[] spawnPointsEnemyExplode;
      public Transform[] spawnPointsEnemyFlyBy;
      
      // Borders
      public Transform borderTop;
      public Transform borderBottom;
      public Transform borderLeft;
      public Transform borderRight;
      
  
      //Used to put active enemies in a list
      public static List<GameObject> activeEnemies;
  
      void Start () 
      {
          // Starts a coroutine function for spawning bouncing enemies and fly by enemy
          StartCoroutine(SpawnBouncingEnemy());
          StartCoroutine(SpawnGrowerEnemy());
          StartCoroutine(SpawnEnemyFlyBy());
          StartCoroutine(SpawnMineEnemy());
      }
  
      void Awake()
      {
          // Create the list
          activeEnemies = new List<GameObject>();
  
      }
      
      // Spawn a Bouncing enemy
      IEnumerator SpawnBouncingEnemy() 
      {
          //Wait 3 to 5 seconds when game starts to spawn a ball
          yield return new WaitForSeconds(Random.Range(1, 3));
  
          while(true)
          {
              //Calls the function to set random position
              Vector2 spawnPoint = RandomPointWithinBorders();
              
              // Show spawn location for one second
              Object marker = Instantiate(showEnemySpawn, spawnPoint, Quaternion.identity);
              yield return new WaitForSeconds(1);
              Destroy(marker);
              
              // Spawn enemy
              GameObject newEnemy = (GameObject) Instantiate(EnemyBouncingPrefab, spawnPoint, Quaternion.identity);
  
              activeEnemies.Add(newEnemy);
  
              yield return new WaitForSeconds(Random.Range(4, 6));
  
          }
          
      }    
  
      // Spawn a Grower enemy
      IEnumerator SpawnGrowerEnemy() 
      {
          //Wait 3 to 5 seconds when game starts to spawn a "grower"
          yield return new WaitForSeconds(Random.Range(20, 40));
          
          while(true)
          {
              //Calls the function to set random position
              Vector2 spawnPoint = RandomPointWithinBorders();
              
              // Show spawn location for one second
              Object marker = Instantiate(showEnemyGrowerSpawn, spawnPoint, Quaternion.identity);
              yield return new WaitForSeconds(1);
              Destroy(marker);
              
              // Spawn enemy
              GameObject newEnemy = (GameObject) Instantiate(EnemyGrowerPrefab, spawnPoint, Quaternion.identity);
              
              activeEnemies.Add(newEnemy);
              
              yield return new WaitForSeconds(Random.Range(20, 50));
              
          }
          
      }
  
      // Spawn a Mine enemy
      IEnumerator SpawnMineEnemy() 
      {
          //Wait 40 to 60 seconds when game starts to spawn a "Mine_enemy"
          yield return new WaitForSeconds(Random.Range(45, 60));
          
          while(true)
          {
              //Calls the function to set random position
              Vector2 spawnPoint = RandomPointWithinBorders();
              
              // Show spawn location for one second
              Object marker = Instantiate(showEnemyMineSpawn, spawnPoint, Quaternion.identity);
              yield return new WaitForSeconds(2);
              Destroy(marker);
              
              // Spawn enemy
              GameObject newEnemy = (GameObject) Instantiate(EnemyMinePrefab, spawnPoint, Quaternion.identity);
              
              activeEnemies.Add(newEnemy);
              
              yield return new WaitForSeconds(Random.Range(50, 60));
              
          }
          
      }
  
      public Vector2 RandomPointWithinBorders()
      {
          //Code that will spawn a bouncing ball and ShowSpawn at a random position inside the borders 
          Vector2 random = new Vector2();
          random.x = (int)Random.Range(borderLeft.position.x, borderRight.position.x);
          random.y = (int)Random.Range(borderBottom.position.y, borderTop.position.y);
          return random;
      }
  }