Yes, the Ace Slider's do block most of the little rocks/stones that would be hitting the back fender flare if you did not have the slider's. This is with 2 dr and 4 dr JL's.I have a set on order for my on-order 4-door. I've always owned 2-doors so I'm unfamiliar with the potential rock chip damage on the rear hinges.
ACE owners: do they provide meaningful protection?