Just finished assembling my IM APS stand for a Nuvo Fusion 40 aio. Left to right, the tank is level. Front to back this is what I have. I’m not sure what I can do to fix it as the stand has 4 foams pads, one in each corner.
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I cannot imagine that amount of difference would ever cause an issue on such a small tank. Levelness is not really the issue that leads to failures. It is when the tank is not fully supported around the rim that causes the glass to bend and puts stress on seams. You want to make sure the tank is fully supported (no gaps) between the bottom rim and the stand.
If there is a mat between the tank and the stand it should compress and provide adequate support (provided the gap is not too great). The floor mats should do the same. It is next to impossible to get a stand completely flat so the compressible material helps to compensate for any unevenness in the stand. I would fill with water slowly and see that the gaps are closed as the mat compresses. I like having a compressible material between the stand and the tank to minimize any stresses on the seams, even on rimmed tanks.