My roosters WILL fence fight if they can see each other.
A correctly placed
E wire can do a world of good, It's what I use on my 4 ft tall wire fences. Otherwise I do recommend a
visual block... as the fence that keeps them apart also keeps them from settling their dispute. No one wins and both walk away bleeding with fence injuries and frustrated... this is even true for my roosters who have lived together happily without the fence separating. The fence changes things.... even for dogs. But, it takes two.. if one boy is more interested in hanging with his hens then at the fence... then crow offs it is.

I was considering doing hedgerow type stuff.
If cross breeding isn't an issue... some have flocks with separate roosters... they mostly avoid each other but try to mate the others hens when possible... all free range and go to their own coops at night.
How big is the property? Another option... a central yard that is empty... so the fence isn't directly connected to each other. Even some of hens actually fight through the fence!
Or if currently together and genetics isn't an issue... they may be fine happily ever after.. lots of flocks have two roosters.
It will all depend on the individuals ultimately.
