Mount any Raspberry Pi 5 to standard 35mm DIN Rail.
This part simply clips on to the rail and will stay in place without sliding or wobbling around.

You will also need 4pcs M2.5 x 12mm screws, nuts and washers to secure your board to the bracket.
 
I printed this on my Bambu X1C, using PETG filament, a 0.6mm nozzle and .18mm layer height with no supports. It printed in under 30min.

Side note:
Many Pi HAT's also have the same mount dimensions as the Pi, so you could possibly use this to remotely mount these HAT's, and keep enough room on the Pi for heat sinks and fans.
For example, i have mounted a breakout board to this bracket(Pictured), while my Pi is actually mounted on the back of a DSI display, with an active cooler. The Pi is then connected to the breakout board using a 2x20 ribbon cable.