Stacking worked well for me, no mounting required.
I built a stand with scrap wood, and it is basically a rectangular box with supports that sits at a 60 degree angle so gravity keeps the tubes in place. Construction took 20 min. The weight of the glass prevents anything from moving around and it's such an easy solution! Also, if you mount at an angle the tubes can be shorter, and you can see all of the colors better.
I also used heavy, commercial-grade paper towel tubes instead of PVC piping - a pound of glass fits in each and they're extremely sturdy. Plus they were free, already at the right length, and light enough that the whole glass rack can still be moved if need be. I think the length of each is around 8 inches - but take that number with a shaker of salt.
Good luck with your project!
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