I keep my covey communally. Roos can have different personalities as Nabiki said, so it's not guaranteed that you'll have a peaceful flock, but it's possible. I've kept 3 roos with 18 hens for a bit during this spring and everything remained peaceful, no hens were harassed or overbred, but it was only for about a month. I've since separated some of the birds because we're giving them to a family member (not because they had any behavioral issues, but I'm mentioning this because it wasn't for super long). I've had two roos coexist peacefully for months, though.