I can’t answer the stand from Amazon; Mine is adapted from one that @kittski designed.
also see this post:
Regardless of your base, the snugger the fit, the more surely it should stand up.
To illustrate, in my recent Halloween Edge Lit sign, I added tabs on either side to make the acrylic as thick as my slot.
Before the thickener, it flopped at 50-degree angles and didn’t catch the LEDs.
With the thickener, we’ve got maybe 5 degrees of floppy.
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