My permanent seven are good at not scratching furniture. They have only dug up the carpet when trapped, never to get into a locked room, but shia puss does on occassion use the door mat for a scratching post
I have a wall post next to the sofa and when they were first with me moved them to that when they scratched and then praise them even now for using it, seems to work.
My pregnant foster cat is a bit more naughty and scratches the carpet when stretching, but I'm letting her get away with a lot as the poor thing is only just 6 months and about to have her first litter of kits - damn irresponsible owners who dumped her in a field- if i ever find them
So if any of you fancy having more furniture destroyed there will soon be a post with her and kits for rehoming