Home Depot or Lowes?? Have 1/4" firm rubber flooring that I was considering. It is in the carpet/flooring section. This would be VERY good protection if you find the right adhesive ; ) Cut some slits across the backside so it contours well, then contact cement away. I have a slight star in my front fender that I would like to avoid seeing again!
I know I saw it on a 2' wide roll by the foot, or 4' precut in different lengths.. Like this
https://www.homedepot.com/p/Rubber-C...B-13/314377937