Joining the parent club in about 3 months, but in preparation, I’ve purchased a “Couchmaster lapboard” and I cannot recommend it enough. Having shoulder support basically makes it feel like you’re sitting at your desk but comfortably on the couch. The only issue is the couch itself; if it has a lot of bounce you’re gonna have a wobbly desk any time someone sits / stands up from the couch.
Btw I’ve since found you can pretty much just buy some upholstery foam, cut it, put a plank over it and have your very own “Couchmaster” for roughly $20 instead of $200…