Congratulations on your hummies! They're such neat little things to watch.
I have four feeders now. I used to have quite a few more, but I actually ended up with too many birds--I mean almost a hundred! It was just too much work for me to keep the feeders filled and it actually became a hazard to walk outside because the little guys buzzed so fast and close to our heads.
Anyway, I have two double shepard hooks with two feeders each, and one single hook with one feeder. They don't mind being close on the double hooks. I've found that more feeders work better than trying to have one big one, as most of the birds do not like to share the feeders. Some will, but most avoid them if there are too many other birds already there. I have all the feeders around the front of our house, right outside our windows so I can watch them. I keep the three hooks many feet apart, but within sight of each other. That gives the birds a chance to get away from a bully on one feeder, if necessary. They like to be somewhat close, but not crowded. But they still can visible find another feeder.
As to preferring one feeder over another, mine do that too. My feeders are all the same, so it's not the feeder style itself. The one they prefer is actually on a double hook, so there's an identical feeder within 6" of the one they like best. They just tend to flock to one in particular. Also, during the season, they'll change favorite feeders from time to time.
You can pretty much train your hummies to wherever you want them to be. Move your feeders gradually from the area they come to now. Once you get the feeders to the places you want, keep them there at the end of the season. Next year they'll be back at the same place, so make sure you really want to keep feeding them because they do get dependent on us.
Happy Hummy-ing!