I have kapton tape, about 5 layers, on the back of it. I also wrapped my heat block with the tape. It would take a lot to hit it, so no protection there.
How about connecting 4 motors on a single (external) driver? To maintain the needed voltage same, would it work connecting 2 pairs in series and then those pairs parallel?
Just poundering the simplest way to make my bed move with 4 motors.