Here is my current setup using for mounting the electronics. I am using a 12" aluminum DIN rail, with mounting plates for the Arduino and Raspberry Pi. Parts were sourced off Amazon, but you could also 3d print the circuit board holders. Currently the rail is just screwed down to a piece of plywood. Once, I get my Maslow running, I plan on making a permanent enclosure and mount the rail with boards back in it.
If there is any interest in this type of mount or if you have used a DIN rail for your electronics, let me know, thanks.