Soundbars have come a long ways. The Sonos Arc is very impressive on its own, and is easily expanded with their subwoofer and rear channel surrounds. The Sennheiser Ambeo was described in a review "Calling the Sennheiser Ambeo a soundbar is a bit like calling a Formula one Mercedes Benz a motorcar."
As a KEF LS50 owner, i like the poweds LS50 idea, but you give up all surround processing, and would still need a subwoofer. I have also done inwall speakers 3 times. They require an amp with room tuning software or I guarantee you will not be happy. They also require a lot more installation effort than you may want to do or to pay to have done.