OK, so Cuiv did a video on leveling your mount. It demonstrates the same advice that I have seen often. A perfect leveling of an equatorial mount is not critical, PHD2 will keep you on track. But his demonstration was with an EQ mount that has motors to make corrections in both RA and DEC. I don't see how this can apply to a star tracker like the SkyGuider Pro that can make corrections only in RA.
I usually use my SGP with a 400mm APO lens. In my experience it requires near perfect balance, polar alignment and leveling to get good guiding of the RA axis with PHD2 and good tracking with the DEC axis. I work very hard on each one. If the mount is not level it has no way to correct the movement of the DEC axis and you will get poor results. So I don't think that the standard wisdom on leveling applies to star trackers, but the members here have vastly more collective experience and wisdom than I do so I am asking the question:
Does Cuiv's video apply to star trackers?