I have merriams, rio grandes, osceolas, and royal palms, All are kept in 25 x 50 foot aviaries 12 foot tall, with rooste at 8-9 foot hig in the center of the pen, all outsides are circles by 2 strands of electric fence for the REAL preditors.
We also have about 10 spare toms that free range, like the others said, they go straight for the tree tops every evening. It's best for both safety and disease to alow them to rooste as high as possible. This way disease wise, they arent sleeping in dirt or poop or any thing like that, also, about 40% of you poo will be under the roost which makes clean up a lot easier too