>I've never seen one of these, but how do you think they would work?
I imagine you'd have to stand with your back facing the urinal, bent over in a half squat position with your ass sticking out so it's directly above the urinal, and the pee falls straight down

It could be done with pants pulled down a little - that's how many people use public toilets anyway to avoid contact with the seat ┐(ﾟ～ﾟ)┌