Are you thinking that you will keep both roosters but separate them? I think at this stage you are over planning it, but while you are planning it, see if you can give away any roosters that you get.
If this is your first year with chickens, I recommend no roosters because roosters take a bit of experience. And regardless how you act or what you do, some roosters are more aggressive. I know you are trying to be proactive, and that is good, but on the chance of getting some roosters, see if you can give them away. Especially if you have children. Roosters tend to attack children first, then women, then men. A lot of inexperienced people underestimate how violent a rooster attack can be.
Personally, I think you have years to do this hobby, I vote, add roosters in a couple of years. I think you get nicer roosters when they are raised with older hens, who thump some manners into them.
^^ That is all the advice you didn't ask for

. As for the advice you did....sometimes, sometimes two roosters will get along fine without separation, sometimes times they get along for a while, then begin to fight, sometimes they will live in separate pens, sometimes they will fight bloody through the fence. Roosters are crap shoot.
Mrs K