Quantity   Component name
1 × Plywood Board A bit of plyboard someone is throwing away (free)
1 × Steel Plumber's Tape / Strapping Among some stuff I 've"inherited", so free
1 × Picture hanging wire Thicker is prabably better
1 × Screws Short enough so it doesn't go through the board
1 × Zip Ties Lots of 'em. Fairly thick for high strength
1 × Small Adhesive Furniture Feet To aid in air flow. Stick to the plyboard rather than the devices.
1 × Packing Tape To aid in laying out devices and specifically cables/wires