Steam Deck knee support mount

I love gaming on the Steam Deck but needed something to help my tiny boyishly weak arms hold it up during those long gaming sessions on the couch…This is a mount for the Jsaux ModCase ( https://jsaux.com/products/modcase-for-steam-deck-pc0104 ) to use your knees to help support the wieght of the steam deck while playing…I use piece of bungee cord (can be found on Amazon) to get a bit of flex but any rope, band or string will work…