I had the 10T's in a 24 x 27' room for a while. They didn't suffer for lack of bass, in that they went remarkably low for floorstanders without any use of subs. I invited friends over to hear some demos, just to have a chuckle. I made playlists on Spotify honoring the speakers.
Could they still benefit from a pair of subs? Undoubtedly. Let's talk budget. The room is certainly large enough. I only have experience with a small REL upstairs among audio subs. I did have a single SVS sub about 32 inches tall in that room for AV for almost 20 years.
The 10T's have been among my favorites in the house.