Doesn't seem to matter pablotwa. I put it vertically on a wall when I got mine as a test and the rotated away and it still measured fine.
Just remember to mount it parallel to your camera sensor.
Oh and it has a magnet on the bottom so don't leave it permanently attached just in case the magnet affects anything. I managed to get the magnet off mine so I no longer have to worry.
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Mosaic Manual Rotator Checklist?
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