I wanted a wall mount set for my mechanical keyboards to: get them off my desk, display them for all to see, fill in some very sad open space on my wall.
I screwed them into the wall with 1 1/2 in drywall screws, that's it. They're probably strong enough for keyboards and that's about it. I didn't test the hooks efficacy for holding anything stronger because I didn't need them for that.
Also the "Split" version has a slightly wider ledge to support the smaller _non continuous_ keyboard bodies that can't span two hangers.