You can use this brackets to store 11l/22l Ikea Samla Boxes. They keep them from moving and can hold a lot of weight. Each of the two brackets can be mountes using one screw. The pin on the bracket goes into a second hole you have to drill 100mm below the crew. It keeps the bracket from tilting.

I designed this for my 11l Samla Boxes and never tested it with the 22l version, but since they have the same dimensions except for the height, this hoolder should work for both. Maybe someone can confirm this?

The “left” and “right” versions are just mirrored of each other, so you can either download both models or mirror them in your slicer.