The link doesnt work for me. Initially I was going to say you should not attempt to use a stand horizontally (and then get into how it was designed to be used one way, and probably couldn't hold weight the other way); but then I found what I think is the same stand you're talking about?....https://www.amazon.com/Fluval-Nano-Stand-Natural-35-Inch/dp/B0069ZVA0Y
It specifically states it can be used horizontally or vertically so I think it should work in theory. However, the reviews are subpar at best. Seems to be made of particle board (as are most commercially sourced stands unfortunately) and easily swells. So "caveat emptor" comes to mind here.
