Checking for Colliders with Physics2D.OverlapBoxAll Won't Work?

In my 2D game, platforms are randomly spawned within a certain area. The player has to jump on these platforms to gain height. However, a platform will occasionally spawn too high above the one that the player is currently on, preventing them from gaining more height. To counter this, I attached an empty gameobject to the platform prefab with a y offset of 2 that should search a square or rectangular area above its platform for other platforms using Physics2D.OverlapBoxAll after its platform has found a final resting location (which is why there are 2 scripts, since the gameobject needs to know if its platform is done finding a spawn location). If it detects only 1 collider (the platform that it is above) it should spawn an extra platform within that space. However, nothing happens and I can't figure out what's wrong. The console doesn't even say "spawned a platform" Here are the scripts of the platform and its gameobject:

 using System;
 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class PlatformCfg : MonoBehaviour {
 
     bool canStayHere = true;
     public bool canCheckForLackOfPlatformsTop = false;
     public bool canCheckForLackOfPlatformsBottom = false;
     float moveHeight = 1;
     float platformsRadius = 1;
     float moveWidth = 1;
 
     GameObject player;
 
     // Use this for initialization
     void Start () {
 
         if (!CheckForPlatforms(transform.position)) // if spawn point is occupied already
         {
             Displace(transform.position);
         }
         player = GameObject.Find("Player");
     }
 
     // Update is called once per frame
     protected void Update()
     {
         if (player.transform.position.y - transform.position.y >= 5)
         {
             Destroy(this.gameObject);
         }
     }
 
     bool CheckForPlatforms(Vector2 positionToCheck)
     {
         Collider2D[] colliders = Physics2D.OverlapCircleAll(positionToCheck, platformsRadius);
         if (colliders.Length >= 1)
         {
             // if the 'positionToCheck' is already occupied by some platform
             return false;
         }
         else return true;
     } 
 
     void Displace(Vector2 currentPosition)
     {
         // some random position relative to 'currentPosition' parameter
         Vector2 randomPos;
         float randX = UnityEngine.Random.Range(currentPosition.x - moveWidth, currentPosition.x + moveWidth);
         float randY = UnityEngine.Random.Range(currentPosition.y - moveHeight, currentPosition.y + moveHeight);
         randomPos = new Vector2(randX, randY);
         // check this random position
         if (CheckForPlatforms(randomPos) && randomPos.y > 0) { // if it's not occupied and is higher than 0
                                            // take this place
             transform.position = randomPos;
             canCheckForLackOfPlatformsTop = true;
             canCheckForLackOfPlatformsBottom = true;
 
         }
         // otherwise, try to find another place relative to this randomPos
         // since it's occupied, so the platform can't be placed here
         else Displace(randomPos);
     }
 }

using System.Collections; using System.Collections.Generic; using UnityEngine;

public class PlatformDetectorTopCfg : PlatformCfg {

 float insHeight = 2;
 float insWidth = 2;

 public GameObject platform;

 // Use this for initialization
 void Start () {
     
 }
 
 // Update is called once per frame
 protected void Update() {

     if (canCheckForLackOfPlatformsTop) //checks the area for other platforms (and can spawn one) if this variable is true
     {
         Collider2D[] colliders = Physics2D.OverlapBoxAll(transform.position, new Vector2(insWidth, insHeight), 0);
         if (colliders.Length == 1)
         {
             float randX = UnityEngine.Random.Range(transform.position.x - insWidth, transform.position.x + insWidth);
             float randY = UnityEngine.Random.Range(transform.position.y - insHeight, transform.position.y + insHeight);
             Instantiate(platform, new Vector2(randX, randY), Quaternion.identity);
             Debug.Log("spawned a platform");
         }
         else canCheckForLackOfPlatformsTop = false;
     }
 }

}

If anyone knows what I'm doing wrong, please tell me! Thank you.