I made a little electronics bench from wood off cuts with an old PC power supply mounted underneath. I used the magnet slots in gridfinity baseplates as screw holes and made temporary mounts for the electronics in my drawer.

Complete:
ESP32 Terminal Adapter (for 38-pin ESP32-Wroom Dev board)
Raspberry Pi 3 B+ (other Pis should work if the mounting holes are the same)
ESP32-Wrover 26-pin Dev Board (might fit 30 & 38 pin Dev Boards, but this only has two mounting holes - please comment if you've tried it)
ESP8266-Wemos D1 R2 / Arduino Uno
8ch Relay board
Banana Plug mount (2x1 Gridfinity - NOT TESTED)

Maybe Someday:
ESP32-Wroom 38-pin Dev Board (4 mounting holes)
ESP32 D1 Mini
4ch Relay board
2ch Relay board
Something generic that doesn't rely on mounting holes (Ideas welcome)

Breadboard holder used:
https://www.printables.com/model/248418-gridfinity-breadboard-holders/files

Helping Hands used:
Base: https://www.printables.com/model/661006-solder-helping-hands-gridfinity-base
Arms: https://www.printables.com/model/344516-solder-helping-hands

My Print Settings:
My samples were printed in PLA with a 0.4mm nozzle at 0.20mm.