The key to this working is ensuring that the buckets are the only standing water around. If even 10% of the females decide to use your clogged gutter, broken water fountain, or forgotten livestock waterer instead of your buckets, you will still have a mosquito problem.
In other words, the real tip is to eliminate standing water . This matches my experience. Building these buckets did nothing, and maybe made it worse. Putting 1/10th as much effort into eliminating standing water is what actually fixed my problem. Remember, mosquitos can breed in a puddle the size of a bottle cap!
There's been so much rain these past months that my entire yard has been filled with puddles. There's only so much you can do to eliminate standing water when it's everywhere.