I have a really nice new 65” LG OLED and I want to add some nice surround speakers to.  I do not have the option to run wires so I decided to add to my Sonos collection and pick up a Beam 2.  I likely would have bought an Arc if they were available right now.  

My question is this...should I order an Arc or should I just add two 1 SL’s to the back of my room to compliment the Beam 2 in the front of the room?  I will use this setup for music sometimes but primary for watching movies.