How To prevent two GameObject spawners not to overlap.

So currently i am stuck on a problem, where i have two GameObject Spawners, one for Rock Spawner one For Diamond Spawner. The issue is the following: in some moments gameobject of rock and gameobject of diamond overlap with each other. I have Tried different ways, one was with ontriggerenter2d, however that was not a very good solution, is there any easy solution to prevent this problem for occuring?

Here are My four Scripts, i would like to know where can i write "The needed code" to prevent the problem of overlapping.

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class RockScript : MonoBehaviour
 {
     Rigidbody2D Myrigitbody;
     private Vector2 Bounds;
     void Start()
     {
         Myrigitbody = GetComponent<Rigidbody2D>();
         Bounds = Camera.main.ScreenToWorldPoint(new Vector3(Screen.width, Screen.height, Camera.main.transform.position.z));
         
     }
 
     // Update is called once per frame
     void Update()
     {
         MoveRock();
         RemoveRock();
     }
     public void RemoveRock() 
     {
         
         if (-1 * transform.position.y > Bounds.y)
         {
             Destroy(gameObject);
         }
 
         
     }
 
     public void MoveRock() 
     {
         Myrigitbody.velocity = new Vector2(0f, -1f);
     }
 
     
 }

Heres the Rock Spawner Script

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class RockSpawner : MonoBehaviour
 {
 
     public GameObject Rock;
     private Vector2 RockBound;
     
 
     public void Start()
     {
         RockBound = Camera.main.ScreenToWorldPoint(new Vector3(Screen.width, Screen.height, Camera.main.transform.position.z));
         StartCoroutine(Mycourotine());
     }
 
     private void SpawnRock() 
     {
         GameObject rock = Instantiate(Rock);
         rock.transform.position = new Vector2(Random.Range(-RockBound.x, RockBound.x), 2*RockBound.y);
 
         
     }
 
 
 
     IEnumerator Mycourotine() 
     {
         while (true) 
         {
             yield return new WaitForSeconds(3f);
 
             
              SpawnRock();
             
             
             
         }
     }
 }
 

The Diamond Script is Exactly The Same, so i would likely add more gameobject spawners, which means that i have to write overlapping code in each of them right? So in a word i would really appreciate if someone could tell me how can i prevent this problem in my code.