In my experience, proper placement of Perky-Pet Brand hummingbird feeders alone will attract hummers to your garden. After the hummers have found your garden, I recommend placing the feeders under or near trees or shrubs.
Hummers like to perch in a protected area before flying to the feeder.
Also, mold problems are reduced if the feeder hangs in the shade. I like to hang feeders from a branch of an oak tree. I like to put my feeders at between five and six feet high. That provides optimal viewing height and is well out or range of cats. Hummers are very territorial.