Somthing like this:
I’ve not actually tested this, but maybe you get the idea. In fact, we don’t use the overlap of the triggers at all, because in this case, it just complicates the situation. We’re just using them as markers.
You could also do a more elaborate version that does use overlap and destroy, and spawns the boxes at the start of each round. But that would be a lot to explain here.
Tell me how it goes…
( you wanna make that distance to check 100 rather than 50 ).