Not only scratchers near where they sleep but also near where you spend most of your time. For most people that is the couch and the bed.
Cats are very intelligent animals but are not the same as a domesticated dog. You learn to live with them and they learn to tolerate or even like your existence
Declawing is an awful practice. Think of amputees and phantom pains. Do you think after having all the tips of their digits removed that.phantom pain isn’t possible? Behavior problems, inappropriate urinating problems, and early arthritis are very real possibilities.
I have two sphynx cats. Very high drive, active cats that are in to everything. Their nails are trimmed once per week and filed if needed. I have had zero scratching problems and one is still just a kitten. Not saying they never tried, but from the get go were shown where appropriate spots to scratch were.