How well does that work installing on a tower or three story roof?
Well, if you're installing the antenna, you're already up there on the roof or tower, in nearly all cases (the only exception I can imagine is you're mounting it on a tip-up style radio mast). Aligning it is as simple as pointing the antenna North, waiting for it to connect, then looking at the app to determine if you need to rotate it on the mount, before tightening the mount down. The adjustment is only on the vertical rotational axis - the gen 3 "dishes" are designed to flat relative to the horizon. So, it's pretty simple. It's probably the least complicated or daring part of doing a mount at height.
(They also work pretty darned well when misaligned, for what it's worth. I checked mine at 15 degrees out, and saw no real degradation).