I suspect most of the reason outdoor showers are mounted where they are is to keep them inside a large storage area near the water pump. Mount it wherever convenient, just add an extra hand nozzle hanger up high where you want it and the shower hose will reach. Might add that myself.
2019 Wolf Pup 16 BHS Limited, axle flipped
2019 F150 4x4 SCrew SB STX 5.0 3.55 factory tow package, 7000#GVWR, 1990 CC Tow mirrors, ITBC, SumoSprings,