Better way to check for enemies on the left/right side of "array"

Hi, I am making a space shooter similar to space invaders. Currently, the enemies are parented to a single game object, which moves with a script called EnemySpawn.js. At the moment , the script checks for enemies that are still alive that are located to the farthest left and for enemies that are on the farthest right of the array. If the enemies on either side pass the screen boundaries, the entire game object "bounces" back.

Currently, I have the script set to check for only the top row of enemies that are on the farthest right/or left. This is because enemies in the top row are usually the last remaining enemies after all the enemies below them have been killed. However, in rare cases the top enemy gets killed before the one below it, and the script incorrectly checks if the next enemy in the top row will pass the boundary, causing the enemy in the bottom to temporarily dissapear out of view once the top enemy reaches the boundary.

what is the most efficient way of doing the check so that enemies in the farthest left or farthest right correctly bounce the entire enemy array around, without causing enemy on the farthest side to temporarily dissapear?