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IMO levelling is not that important on a GEM, particularly if you will do some form of drift alignment. If the RA axis is parallel to the axis of the earth, who cares what angle the pier plate is on. It just might take more work to get it aligned right depending on the error and might mean adjusting one axis puts the other out of whack.
In the case of a goto Alt Az it is IMO more important. One of the assumptions in the software is that the azimuth axis is properly plumb. You might claw some accuracy back with a three star alignment and/or re centering objects in the software but IMO it is just kludging a software fix for a physical setup issue and some other error is bound to squirt out of a gap somewhere. If that error is noticeable is a different story.
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