Nobody I know has ever managed a strict "no couch" rule. How do you resist that face??
I think a better rule than "no furniture" is "furniture by command only" anyway, especially if you're concerned about dominance positioning
Teach that babies are ONLY allowed up on people seats when they're invited. Our family uses "goojie" for this; it's a nonsense word that doesn't have any other context. 'Snuggles' can be confusing if you're having a conversation about babies, and suddenly YOUR poor baby jumps on the couch thinking he's going to get all his lovies and then you're hollering for him to GET OFF! What's a dog supposed to do?
This used to happen all the time with Katiedog, who was positively indiscriminate when it came to lovies, and took every chance she could squeeze into to get them. My uncle knew a guy who did Schuntzhund (is that how you spell it?) with his German shepherds, and it gave Mom the idea for a out-of-context word---I don't know where she got goojie from, but that's what she decided on. It kept Katie from smothering anyone who mentioned any FORM of the words snuggle, or love, or hug...Katiedog needed a word of her OWN.
Myself, I like nonsense words for things like getting to lay on the couch and be petted and loved on, becaues there's a clear privelege involved with the location and you can include clear behavior boundaries--only quiet, calm dogs get to goojie, for example. Bed sleeping can include a word for being allowed to get up and sleep on the foot of the bed nicely and another word for being allowed to come lie next to you and have lovies in the bed. My cousin adopted Mom's nonsense word theory, and in her house, dogs are sometimes allowed sleep on the foot of someone's bed ("torga") and sometimes to snuggle right next to you on the bed and have lovies before going to sleep ("drayda").
And of course, there's the entertainment value of the made up word. It's kind of fun to have company over, and in the middle of a heated political debate, say "Goojie, goojie" and have your baby jump up in your lap, snuggle down and go limp as a dishrag. Cuts the tension every time. Not to mention the 3 year old who walks up in the middle of Thanksgiving football and asked "Grampy, will you come drayda me for my nap?"