I highly recommend Rythmik servo subwoofers, which can probably control the expected low-bass reverberation problems in your small room. They include superior adjustable EQ, which works better than phone-controlled stuff. Your small room does not need two subwoofers; if you disagree, you can always buy a second one. Don't assume there is a "best" spot--just move a single around and put it where it sounds best, probably away from walls.
Rel t9x or Rythmik F12G
Trying to decide between these two. Similar price. I have a small room (11 x 11) and I am trying to compliment Klipsch Forte 3’s. Looking for the best sounding bass for music only. Anyone have experience with both that can expound on the differences? Amp is a PL Evo 400. I also use a Dynaco solid state rebuild amp. Thanks