May I ask how many roosters you are talking about?
From my experience, if you had two decently sized pens to keep the roosters so that one pen can hold the entire number of them. If you were to use roosters for breeding in groups and such, I agree with the previous posters that it's very difficult to reintegrate them into the same established pen they came from because of pecking order. However, if you have another pen, which is slightly different than the first...you move the breeding roosters back to the new pen and move everyone into pen #2, it's fresh for everyone and every rooster is one the same playing field. That works well for me.
I plan to do something different than all of the above. I plan to AI the hens. I only have the specific rooster out for collection (if I take him out at all) and you know the mating of each hen. Either that or bring specific hens to a pen to be bred. It's only once if it's successful. My roosters can stay in their area without disruption that way. I happen to be dealing with a larger number of roosters.