This is a laundry detergent cup holder that I made to clip onto wire shelves. I had one that hung on the bottle, but it always fell off and made it hard to get the last of the detergent out. Its got some lines on the bottom to make sure your cup doesnt sit in a puddle of detergent and get everywhere when you use it.

I've included the F3D file as well in case you need to modify it for your shelves. I'm not great at 3d modeling so it's not perfectly parametric, but maybe it will help.