I've been using the Ikea KALAS plates as cat food plates for about a decade, and they work fantastic. Wanting to organize them a bit, I printed up this wall mount holder. I've also created a smaller version of this model, suited for holding silicone pet food can lids

Assembly is pretty straightforwards, but I've included a drawing that shows how it all goes together, Ikea style.

You'll need 4 M3x20 screws, to attach the spacer rods to the base plates, and then 3 of whatever wall anchor screws you prefer/have on hand.

I printed the spacer rods in the horizontal position, instead of vertically, like how the slicer would urge you to do, for greater strength. These plates aren't all that heavy, and this is probably overkill, but they also tend to stay in place with a rougher rod, which is another argument for printing them this way.

The spacers I included are 150mm long. If you want shorter ones, they should be easy enough to edit, but you can do so in the OnShape document here. There's a variable titled #rod_length, set that to however long you need, and the whole thing should just work