What's funny about hummingbirds is. In Wisconsin there was a restaurant that had hundreds, if not thousands of hummingbird all sharing feeders during the summer. Yet my experience is you can't get more than 2 at 1 feeder without a chase. Restaurant was a ways up a river from lake wisota
We had approx 50 at our house in AZ and there would be one at each perch plus others trying to hover in. There were plenty of quarrels but they coexisted well enough. It was dangerous to go out on the front patio when one of the feeders was empty; those little suckers would get right in your eyeball and start scolding you. We were refilling three feeders daily.
I think we only had three at the house here in VA last year but we'll see how it goes this year.