While I love the Mainsail interface for Klipper, sometimes you just want to poke the printer and have it do something without pulling up a web browser (i.e. preheat the hotend and bed). So I purchased the BTT TFT35 SPI Screen. I did search for an existing design, but none of them mounted on a 2020 extrusion corner, so here is what I came up with.

I needed it angled up a bit (though I would have liked to have more) since it is mounted along the bottom of my printer. A similar design could be created for a top corner mount.

The holes are designed so that the screen mounts flush with the back of the mount and the holes are sized to accept M3 screws.

If any interest is expressed, I can upload the Fusion 360 model for your own tweaking.