Great mount, don't waste your time with cheaper brands
Peerless is a tried and true manufacturer of projection, and TV mounting hardware. These mounts specifically make mounting and aligning your projector a breeze. They have adjustment knobs on the x and y axis' and a set screw to lock it in once you've got it dialed in. The mount attaches directly to a ceiling or joist. You can also use a 1 1/2" NPT steel pipe you can pick up at the local hardware store or big box stores. I have mine mounted using a 1 1/2" steel pipe dropped from the ceiling.