Just stick with a pair. Unless you have a huge tank or more host anemones than you can handle, keeping a large number is asking for trouble. While diving in Hawaii I saw a 5x5' anemone of some sort with 10 or so black and white clowns. They looked like they were duking it out to the death!
Assuming you know which are males and females, keep one male and one female. If they are ALL females, just keep one female. Multiple females will fight it out to the death.
I've just got one Ocellaris so I don't have to worry about it