To give yourself the greatest odds of attracting hummingbirds, it's necessary to strategically place feeders that will increase your odds. Some regions are fortunate enough to see generous numbers of hummingbirds while others have to invest an enormous amount of effort just for the potential of having one solitary hummingbird arrive in their garden. Whether you're in the region that's densely populated with hummingbirds, or in a region where you rarely see them, here is one way that is sure to increase your population.
I want you to think about it in this way. If you have a single hummingbird flying from the south and you have a single feeder tucked under the overhang of your home on the North side, you've greatly reduced the chances of that hummingbird spotting the feeder. If that's the only bird that happens to fly through your region, you've pretty much spoiled your chances. Although hummingbirds have remarkable vision it's impossible for them to see through buildings and dense forest. Islands or large clusters of flowers provide great targets that can easily grab the attention of any hungry hummer. Placing a feeder within those clusters is it great option, but to grab the attention of every possible hummingbird, you need to make those feeders visible from every direction. Raise feeders, place them on the outside of tree lines, place some in wide open spaces, and simply make them visible from every direction of your home. Don't worry about the fact that hummingbirds will be feeding from those feeders that are not visible from your home, because once they locate those feeders, it increases the chances of them sticking around, and once they do, they will familiarize them self with every location of your garden, and locate the feeders that you have near the house. Increase the visibility and you will increase your odds.