Add an offset distance between 2 spawned objects

I am trying to make a simple 2d platformer game in unity. While doing it i have encountered a problem with spawning objects. The newly spawned objects is overlapping each other. My question is how to add an offset distance between the gameobjects. Below is the code i used for the spawning.

  public class spawnscript : MonoBehaviour {
     public GameObject[] obj;
     public float spawnMin;
     public float spawnMax;
 
     // Use this for initialization
     void Start () {
         Spawn ();
     }
 
     void Spawn()
     {
         Instantiate (obj [Random.Range (0, obj.GetLength (0))], transform.position, Quaternion.identity);
         Invoke ("Spawn", Random.Range (spawnMin, spawnMax));
     }
 }

the game objects is having different dimensions