You will have to separate them at most 5mo. If they're with a hoot or they will fight and kill each other
You can do trios likely if they are put together very young or after about. Year and a half. Adolescent age the stag doesn't yet know its his lady friends and will want to kill them. If you let the hens from a trio go broody and you split them up you will not be able to put the hens back together they will most likely kill each other.
PLEASE IF YOU DECIDE TO HATCH ANY PLEASE PLEASE EDUCATE YOURSELF ABOUT HOW TO PROPERLY CARE AND HOUSE GAMEFOWL.