With no lens shift; make sure when you find the center of the screen on the ceiling, that you align the center of the lens and not necessarily the center of the projector. If the lens in center mounted in the projector, then it is one & the same. But if it is offset.... I've seen installers make that mistake more than a few times.

Also make sure you get your drop calculated well, so the projector lens is vertically aligned also. If you can use a pole extension with a lot of very small incremental adjustments, that is ideal when dealing with projectors like that.

Product I like:
[Link: docs.peerless-av.com]

With this pole adjustment:
[Link: docs.peerless-av.com]

And a top plate, depending on your installation.