A:AnswerFrom leg to leg my Q80R measures 39 inches. I do not know what the dimensions of the Sonos Playbase is. If you have a TV table with more that one platform then yes it would.
A:AnswerIf you purchase an after market 'universal' remote, then yes. The Samsung remote will not operate a Vizio soundbar - only Samsung sound bars are recognized by Samsung remotes.
A:AnswerQ80 has the wide angle viewing. Q70 loses contrast and color when not viewed from directly in front of the tv. The tv is brighter too. This is what finalized my decision.
It’s about 2.5” thick at it’s thickest point.