We have three 32oz feeders and one 48oz feeder, all about 10 feet from each other. If one male tries to dominate, the others just use the other feeders until he leaves. I would be shocked to look out the window and not see half-dozen or so at any given time. I use two other 32oz feeders to rotate while I clean and fill the primary ones. My wife wants me to hang more feeders, but I think we have plenty of hummers already!
Bees? We have plenty of other hummingbird flowers in the same area, and the bees prefer lavender and Mexican Heather to the feeders. The Hummers do respect the bees however and will move out of the way for them.
When I fill the feeders each morning, Hummers will get quite close to me and if I move slowly, some will perch on my finger and drink from the feeder. Sometimes they buzz right in front of my face to check me out...I used to wear sunglasses because I was afraid they would poke me in the eye before I could react, but I've also gotten used to them now.