IF you are going to have two roos - - you will need to get enough hens for each. Each roo can service 7 -10 hens.
I have a wide variety of hens and 1 roo. The only eggs I will hatch are the ones that are the same breed as the roo. All my breeds lay different color eggs so that I can identify who is working and who is not. If you get EE hens, you will be able to identify their COLOR eggs and just don't hatch their eggs - eat them. Your Roo will have his choice of hens, you get a variety of hens to look at, and if you only hatch the appropriate eggs, you will keep the breed pure and have some chicks to raise or sell.
I have some baby roos right now. When they get older I will have them in a separate pen because I don't want two roos - two different breed roos - mating the same hens.
Some people are able to keep more than 1 roo with the hens with no problems. If your girls start looking messed up - - - you have too many roos or you need to separate the roos. Sometime the roos will have their favorite girls and will only party with them. So, even if there are plenty of girls - - some get too much action. Some roos are just too rough.
My personal belief is roos can be replaced easily - - - hens can not. . . . . If the roo doesn't want to play NICE, then he can play somewhere else.