Sonos One Gen 2

Literally it just works. Plop a speaker into a room, set it up instantly, and you've got music. Yes, they're more expensive. But if you don't want your spouse staring daggers at you every time your hacked together alternative doesn't work when he or she wants to play music, just get the Sonos system.

Their soundbars are similarly great, and you get the bonus of great music playing when you're not using the TV.