My understanding is that the tank needs to be level, or else it is vulnerable to failure. I'm lucky that my floor is level and the tank is level, but I think if it's not you need to level the stand to make sure the tank is level. Some people use shims. If the water tilts even a little it can put too much pressure on one part of the tank.
I'm referring to building it. You don't have to build a stand on a level surface. Take a perfect level stand and put it on an unlevel surface. If it's level then it will match the unlevel surface.
The stand should always be altered or maintained as level when it is permanently stationed before water is added.
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