I think all rimless tanks, assuming they don't have even a bottom rim, have the bottom glass resting flat on whatever stand you use. Two points of view: one would be that you need a very flat top, supported with closely spaced structural members, and with a cushion on it to even out the load. Another is that if you were to put a bottom rim on the tank, it would only support the outer edge of the tank, so why not just support that outer edge without the rim? I think I go with the latter point, so I would want a level, even top under that outer edge only, but cut out in the middle. What would Amano do?