I have 3 males and they are the ones that stay in their own tubs.
The males, I have in a 3 drawer rack I stole from my wife (she was not using it). The space is about 1-1/2' x 2'.
I have a Sterilite Tub for my females to have babies. This tub is pretty big, I have a couple cheap hard plastic bowls put together for their nest. I mounted a wheel on the side of the tub for them to play on.
I also have a Critter Trial Cage (bought thus when I 1st had mice). I put the males in here when they are 4-1/2 - 5 weeks old. The cage us not big, but I always have very few to no males because males are the first ones I feed to my ferret.