I've seen nice displays of aluminum sheets by gluing some wood to the back of the sheet. Just a couple of bars attached horizontally (to floor) about 1/4 to 1/3 of the sheet width in from top/bottom, and shorter than the sheet by enough so that you don't see the bars unless you look for them.
This does two things for you. First, it spaces the sheet off the wall which helps with that feeling of depth, and it does it so the sheet is nice and stable and parallel to the wall. Second, it gives you a place to attach hanging hardware so that you can hang it without the hardware being seen, and without the sheet leaning out from the top like conventional framing tends to do. The combination is a very clean presentation -- it just floats off the wall a couple of cm without any visible means of support.
You may not want such a contemporary look, IDK. Depends on the look you are trying to accomplish. It's just one way to do it, and of course there are many paths to the waterfall.
Edit: Oy! Monty beat me to it. I'm too old and slow for sure.
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