You're welcome, Kinhoang. I bought a pair of speaker stands from Sound Anchors. The proprietor has a set of 215 DMT drawings, and he makes sturdy custom stands for the 215s. Mine are mounted vertically with bass drivers on the bottom and port holes on the outboard side. Speakers are toed-in slightly so that the lines of sound converge just behind my listening chair which is about eight feet away from the speakers. This set-up was recommended by Peter Lanzilotta, who is a recording studio guru. It's amazing to think that many of the greatest recordings were final mastered on these very speakers that I use in my listening room!!!
Also, I have used 300B SETs with 8-12 watts on these speakers with no problem. But the Jotas do a better job controlling the bass.
Enjoy :)