I can’t speak for the Eero Mesh system as I use Amplifi Alien router and mesh but in that room proximity may become a performance issue on the mesh unit as they typically like to be further away from each other.
I used to use a Powerline extender and it worked well- you would just lose two outlets in your room. I recently purchased a second Alien to act as a mesh as I needed additional Ethernet outs. Either solution works great and there is no difference in audio performance.