These Rpi's aren't cheap nowadays so why not provide some over extensive cooling for them?

This is my personal use case, but these fan mounting plates can be used for other purposes as long as they are mounted on 2020 or 4040, or 2040 Misumi standard extrusions and are aimed to attach 6010 or 6020 fans to them.

Use No distancer version for the 6010 fans and with distancer for 6020. The exact fitting can depend on how you mounted your Rpi or another device(s) you aim to cooldown.