Todd,
Grumpy merely posted some of the German to English translation taken from the pdf file that Rob had previously posted.
Clearly the Google phrase
"free placement" twigged a reaction ( though I believe the phrase was merely an awkward translation for
"free-standing" .
Your concerns are still very valid when it comes to achieving the proper integration of these units with mono-pole drivers.
From this pic it would appear you have some response/diffraction issues ? with your 2251 ( a somewhat similar predicament faced by Bill Shenefelt in the distant past >
HERE! ;