You will need a top for your pen. Ive seen my birds fly almost straight up 30+ feet high into a tree. Use a netting for the top. It will give when the birds fly up and hit it. If you clip their wings and a predator gets after them they can't get away. Each birds need around 100 sq ft. So that pen should be fine. As far as having 2 males together that depends on the birds. Some males get along some dont. Hope this helps. Check out Hopkins Alternative Livestock and Leggs peafowl. They have some really good info that will help.