Array of prefabs with different sizes stick to each other

Hello, Im quite new to Unity and coding. (really like it though) :) I'm struggling with a prefab array that I instantiate and move. See the code below. I attached a separate script to the prefabs with a x.movement like this transform.Translate(Vector3.right

Now the prefabs are instantiated on a timer and they move in the x position. But this is not what I want. The prefabs are different sizes in the x. I want my instantiate to know what the sizes are and instantiate them with a given gap in between. I did a lot of googling and came across bound.size.x and renderer.bound. I think I need to calculate the timer to a prefab bound size x, but don't know how... Also I think I need the movement script in this timer, not as a separate script. Am I on the right track? Can anyone give me some clues?
Thanks!

         private float timer = 0.0f;
     private float TimeToRespawn = 2.0f;
     
     public Transform[] Spawns;
     public GameObject[] Prefabs;
     
     void FixedUpdate () {
         timer += Time.fixedDeltaTime;
         if (timer >= TimeToRespawn)
             SpawnPFB();
         
     }
     
     
     void SpawnPFB(){
         
         timer = 0;
         
         int tele_num = Random.Range(0,1);
         int prefeb_num = Random.Range(0,2);
         
         Instantiate(Prefabs[prefeb_num],Spawns[tele_num].position, Spawns[tele_num].rotation);
     }
 }