I'm just building a house at the moment and planning a home theatre room with new Sonos gear - Arc, sub and 2 Era 300s . On the installation front, I’ve been reading reviews this morning and one indicated a need for ethernet cable connections to fix a lag between the Arc and the Era 300s and sub (https://cybershack.com.au/reviews/sonos-era-300-as-rears-to-the-sonos-arc-superb-dolby-atmos-7-1-4-review/?unapproved=60193&moderation-hash=9d98285680f738e006005efc5e7695f2#comment-60193).
The Arc will be connected to the TV with an eArc HDMI cable. The TV will be connected to the router with an ethernet cable. I wasn't planning on connecting any of the 4 Sonos speakers via ethernet, instead I was planning on just relying on wifi connection (as I have for all my current existing and past Sonos gear). Based on the review above, that could be a problem. Do others agree and, if so, should I provision an ethernet cable back to the main router, or is there some way of directly connecting the Arc, Era 300s and sub together? Thanks so much in advance!