KlopKlop
Crowing
When they are young they will jump and fly 3-4 ft high When they get older they do not go more than a foot or two up, at least mine don't. You will not really need a fence. Turkeys never run away and their preferred sitting/roosting area is the back porch/deck.
I would think your fencing idea would work. Just know turkeys are naturally friendly and love people.
My issue is that I'm in an area that i worry that chickens could share worms with the turkeys if I let them in the same area. The area I want to put the turkeys is up the hill and away from the chickens.