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Yes the NJP does go about 15 -20 degrees past horizontal (1 hour -15 degrees) but its a physical stop if it goes too far and it can crush the little cable for one of the encoders or bang your camera against the pier if the orientation is that way.
The PME and I assume the MX has software limits so it stops at the assigned angle. I am sure with some study it can be made to do a meridian flip and plate solve.
By the way the Chuck Faranda Temma driver now also has an experimental meridian flip option. Not sure how well it works. My NJP polar alignment would most likely get the object in the image but not exactly as it was with a flip. It would need to be reframed (same with PME the way I am using it at present).
Greg.
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