I have the Cornwall 3's in a dedicated listening room 16' x 20' and I started out on the short wall, but they didn't really shine until I put them on the long wall, in the corners at a 45 deg angle.
My speakers are a little over 13' apart ,inside front corner to inside front corner, you may have to place yours a little closer being 14' wide vs 16' , but it is free to try.