IKEA Samla box holder

I wanted to hang some IKEA Samla boxes below my bathroom shelves, so I looked around and found a holder on Thingi. It was only for one box though, and as I wanted to have multiple boxes next to each other, I remixed a double-sided holder. I also changed the screw type to countersunk. I know it's less durable, but it looks nicer (to me, that is) and I think it will still hold up to the loads.

The screw holes are supposed to take a 3.5 mm screw, head size 8.2 mm.

The original only had a one-sided version, I made a double as well and changed the screw type to countersunk