I’ve got a revolutionary thought ..... how about asking the tank manufacturer what they recommend. Most rimless tank manufacturers require full spanned support for the bottom with a foam layer in between. Plywood has very little support through the thin dimension so would likely only be good of there were cross members in the stand. Good quality BC plywood in 3/4” is generally perfectly flat. Hardwood ply even better. Stay away from the plywood sheathing. I would not personally put MDF or particle board anywhere near my tank.
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I've seen a lot of questions like this lately and while asking questions here is awesome, some things are best left to talk to the manufacturer directly about. Taking the wrong advice could quickly void any warranties the tank may or may not have or worse it could put your tank at risk of failure. I've already seen some questionable advice in this thread and I think the OP should contact the Manufacturer directly and stop looking here...
I also haven't seen anyone ask if this is a full Trimless tank? Rimless and Trimless are two different things that I often see people forget to realize or ask about.
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