I think the only reason people say don't let a meat bird perch is that if you are going to eat them, you don't want blisters forming on the breasts as can happen, but as Harry is not going to be eaten, I'm sure he'd love a perch, but like Joy says, maybe only a few inches off the ground as he is a big boy, but don't be surprised if he has a heart attack one day, heavy meat birds weren't meant to live to a ripe old age, its in the genes!