I think the Twin6 Focals would be an excellent fit for your room. I think anything larger would be somewhat impractical physically, and their “built like a tank” cabinets will help minimize the amount of LF radiation from the back of the box to the wall behind them. The (relative) amount of money you’ll save over larger monitors can be put to good use for some selective room treatment (corner bass traps like these
https://auralex.com/lenrd-bass-traps/) and some absorption directly behind the speakers — maybe some side/rear diffusion as well.
FWIW, my first home studio had Fostex RM780’s
directly mounted to the front wall above the console (gap of about 3” to wall) using Omnimount ball/socket mounts (see pic below — good luck finding some these days) with 2”D Sonex panels covering the entire wall behind the monitors (from the desk surface up to the ceiling) — and we mixed commercially-released product successfully, albeit we usually referenced our “final” mixes by playing them back on other systems in larger rooms to gauge our LF accuracy (which was usually close to if not spot-on). BTW, the front wall construction was super-stout, so this was an appropriate solution for this particular room — YMMV.
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