I have two bonded pairs of Serama and one Roo that has 3 ladies. I like to keep them in pairs, to be honest, but I have one hen that's overbearing, so she gets to boss the other girls. They don't overmate. The females will NOT let that happen. [talking about my birds]
The crowing is like a squeaky toy and sometimes they alarm call because the big chickens outdoors are doing that. It's more lovable than annoying. Mine are in my house and don't wake us up, whereas the roosters out in the coops do.
I keep mine in Rabbit hutches, just for the ease of cleaning the pull out plastic tray flooring.