Elgato Stream Deck + Plus mount for 4080/2060 aluminium extrusions.

Use M5 bolts + T-slot nuts to secure to the extrusion, I have made multiple holes in order to be able to offset it a bit (mine was getting in the way of my knee).

If you use it on your rig, make sure you have enough clearance to put a screwdriver through to push back the Stream Deck, otherwise it will be a one-time fit.