Avoid overlapping of random spawned prefab

Questions & Answers
1

I used a code to spawn 2 different prefabs .The script is working but sometimes the objects get’s overlapped ,and I can’t figure out how to avoid this overlapping.

	void SpawnSpike()
	{
		//the bottom point of the screen
		Vector2 min = Camera.main.ViewportToWorldPoint (new Vector2 (0, 0));
		
		//this is the top-right point of the screen
		Vector2 max = Camera.main.ViewportToWorldPoint (new Vector2 (1, 1));
		
		//instantiate an enemy1
		GameObject anSpikesGO = (GameObject)Instantiate (SpikesGO);

		anSpikesGO.transform.position = new Vector2 (Random.Range (-min.x, -max.x), -max.y);
		
		//Schedule when to spawn next enemy
		ScheduleNextSpikeSpawn ();
	}
	void ScheduleNextSpikeSpawn()
	{
		float spawnInSeconds;
		
		if (maxSpawnRateInSeconds > 2f) 
		{
			//pick a number between 1 to max
			spawnInSeconds = Random.Range (2f, maxSpawnRateInSeconds);
		} 
		else
			spawnInSeconds = 2f;
		Invoke ("SpawnSpike", spawnInSeconds);
	}
2

Use Physics2D to check if the spawn position is occupied and keep checking random positions until you find a blank space.

int attempts = 0;
		do {
			// Get a Random spawn Position

			if(!Physics2D.OverlapArea(topLeft, BottomRight)) { // Check the bounds of the spawn position
				break;
			}
			Debug.Log("Collision during spawn at: " + temp);
		} while (++attempts <= 10); // Limit spawn attempts to prevent infinite loop
		if(attempts > 10) {
			Debug.Log("Failed to find a clear spawn point");
		}
3

There’s several ways to accomplish this but I think the easiest would be to use a collider or trigger and using tags. If it collided with an object with the same take, re-position it again using random range, as you have done.

4

use raycast using the object witht/hight divided / 2 as the max distance on -x, +x,-y,+y directions. if it returns anything repeat until you find a proper spot.