Sonically I don’t think that this is a great idea, but only you know what sounds “best” (to you).
In terms of hookup and control this will be difficult. You’ll need to use both optical and HDM-ARC connections to the TV. Not all TV’s support this and I’m not sure if lip sync will be perfect. Plus, each BEAM will be a separate Room in the controller. Adjusting Volume will be difficult. Yes, you could connect only one BEAM to the TV and Group the two Rooms, but good lip sync will not likely be achievable.
At best this will be a science project.
My spare Beam v1 makes a great bathroom speaker, on the cabinet over the toilet. In that small room it really sounds great.
I’d look at any room where you don’t have Sonos now, a Beam sitting on a shelf or cabinet top is about invisible but is going to sound pretty good.