To answer this, please provide the year and exact model number.  In the meantime, you may want to do search on Q80R.  It does not have the eARC needed.  Also, if you have not looked into this, check out the posts regarding audio lag on Samsung.  It’s not a Sonos problem per se, but Samsung’s lack of quality Audio Return Channel engineering.    I have several posts about it.  At one point I thought it was conquered but it’s not.

I have a 2020 Samsung Q80T with eArc. I am having zero issues with Atmos feeds or lip sync issues so far. 
System is working as designed and really kicks some but with the Sub and a pair of One SL rears. 

@Alberta Beagle That is great.  I am finally working with Samsung to refund the TV.  I submitted all the paper work.  I’ve been checking brands for a 75” (no larger) and based upon the pricing the Q80T was still in my range.

Thanks for the reply @MSterling 

The exact model number is QN55Q8FNBF.  It’s a 2018 model.

@gcforbes that model does not have the HDMI-eARC (extended audio return channel) which is required from the TV to receive the Atmos signal assuming the content produces it.