Someone else here mentioned it but it seems like it might be worth exploring a Line-X type spray on material just on the bumper if you are worried about scuffs and stuff. The work the crew did to spray Line-X on our F-150's bed, tailgate (inner) and sidewalls was terrific -- they removed bolts, fasteners and anything else that shouldn't be sprayed and applied it with no slop.

A major caveat however is I am unsure if they can apply it to plastic surfaces (like the Escape's read bumper cover) and even if they can, how likely it would hold to that surface vs. painted, clearcoated metal such as is found in a pickup truck bed or other portions of a vehicle. I also don't know if they'd need/want to remove the entire bumper cover to apply the Line-X or if they could mask it off and spray/dry it in place.

It's quite sturdy material however, if you find it's possible -- we've had a full load of landscape rock, soil and mulch (not at the same time; different occasions) as well as pavers and the like in our pickup bed and after the powder/dirt washes away the liner is like-new with no imperfections, scratches or holes. It is a high grit surface however, not something smooth.

Otherwise, perhaps buying some automotive/outdoor grade rubber and using the same high adhesive backing used on autos would work -- cut it to fit, although it will have to be flat vs. actually form-fitting the bumpers we have.