What is the opinion of Reddit about the
KEF LSX Wireless Music System (Black, Pair) LSX Black?

I love Sonos but for what you are looking for, I would recommend a pair of KEF LSX powered bookshelf speakers. Huge sound for their size and can stream Spotify. Watch some reviews on YouTube and/or go demo them at a BestBuy Magnolia store.

https://www.amazon.com/dp/B07JFK339D/ref=cm_sw_r_cp_api_i_NlS2DbKN5Q1QT

Or SVS Prime and $100 over budget, KEF LSX.