I am about to install two beautiful Aquia CST412's to replace my P.O.S. Am Std low flush (no flush?) toilets. All pics here generally show that the water outlet comes out of the wall. In my case the outlet is from the floor. First (perhaps stupid question) but why does it seem like the wall-mounted outlet is preferred? Second question: the existing floor outlet is about 3-1/2" from the base trim to the front edge of the escutcheon. Any reason to think there'd be any interference with the toilet's base (it seems to have about 6" clearance)?