Oh that hen to rooster ratio that everyone refers to, yet never the same number nor the reasoning behind said ratio. Truth is it all depends on the space you are providing them, the males as individuals, the breeds and even the age. If you want to be safe rather than sorry, cull the males you find less desirable and keep only the best ones, which in your case would be one. If you want to go the route of keeping all the males and seeing how it goes, do so only if you have the space to separate them, and the heart to give them away