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I know this wasn't aimed at me but I'd like to offer some of my experience...
I have 6 roosters in a 30' x 30' run, and 3 more in another same sized run. They come out to free-range when we are home only, generally in the evenings.
GENERALLY if they are raised together they will get along fine. Sometimes it works sometimes it doesn't. My AM's are great with each other, and the ladies. But I've had broilers who just gang up on the females and were just butt-heads. I don't have any issues with the AM's though.
18 girls for 2 boys you should have no problems at all. Are the boys currently together now? I would put them if they aren't, the younger the better.
I think 10 x 20 is fine for 2 roos, just make sure they are raised together from a young age.
When I first added my cockerel to the pullet flock he was a month younger than them and there was only one of him and 10 females. They picked on him a lot and pushed him down the dominance ladder. It took him a long time to work up the chicken ladder. The more chickens you add at once the better, and the younger they are the better, they will know they are submissive and there will be less fighting. If you add them when they are older they like to try to establish dominance right off the bat.
Hope this helps!