I’ve got a number of tiny glue bottles that must be stored on their heads to work well. One of them has a weird shape. So I customized a paint bottle rack design I made on the boxes.py site to work the way I wanted. Made from glass-green medium Proofgrade acrylic. The key feature is a little well at the bottom filled with a flexible silicone that seals the tops so you can grab and use the bottle at any time.
The well is made from a watercolor half pan, and I filled it with Let’s Resin 2-part silicone mold making material. The pans have a slight slope to the sides, so they rest in the holes without gluing, in case I need to change the silicone.