I got myself a small TV-tray type table for Christmas and designed this mount for comfortable couch gaming. 

Fits my 12.5mm thick table. If you want to try it but need a different size slot, feel free to reach out.

Has recesses for 10mm rubber feet.

Pictures show v1, which limits the range of possible positions. v2 is modified to give more room to fold the arms but hasnt been tested since it's not an issue for me.