they can fly up high, ours used to sit on our roof.
we never ate them or bred them but had a flock of 15 for years. once we let them free range we never touched them again, so if you want to harvest them in some way you may need to contain them.
my old boss kept them in a barn (about 14ftx30ft)with a netted front but she ate them.
i liked them though but they did go in the neighbours garden and roost in their tree