My birds are free range only close on roost . I have 30 large and 13 Bantams 3 Bantam Roos in the mix two lg Roos Americana And Buff op Roos they have their own. Free run gangs but all get along very well minimal fighting
I have exactly what you want the Americana too will breed the Mill e Fluer hens I’ve seen it but no harm so far and not that often that I see But they get along fine