There is no rotation mechanism on any SNK cab one as none of the MVS library supports 3:4 aspect ratio. SNK didn’t allow people to make vertical / tate games at all which is apparently one of the reasons Psikyo stopped developing games for the hardware.
The Sega Aero Table and Jaleco pony Table are rotatable and those do come up for sale a few times a year but you are looking at forking over at least 2-3k for even non mint examples.
Like everything else the prices have easily doubled over the past four or so years on these more desirable cabs. The real problem I find in trying to acquire stuff like this is increasingly people don’t want to sell, it’s all about trading one for another regardless of how much you offer.