Not if its a les paul...
Doesn't mean that shop hangs their LPs mean that it's the right thing to do.
Micheal Phelps eats 12,000 calories worth of shit everyday, should I follow his diet if I wanna be an olympic legend?
1) that since an lp is pretty heavy
2) and that weight will put a strain on the headstock and wall mounting piece
3) therefore you shouldnt hang an lp for long periods of time