The assymetric mounting of the SXTsq is not what you normally expect. For a mechanical engineer this is not the best way to make a stable fixation. (The tension in the metal belt must be high to create enough pressure between SXT and the tube due to the bad pressure angle, and only the friction from this pressure can create the needed torque to stop forces that now have a long lever.) But the SXt is lightweight, and maybe it all can hold its position in the recent 130 km/h wind storms.
If you prefer a more central bracket then maybe one can 3D print the standaard SXT/Omnitik slot. (https://www.thingiverse.com/thing:3062748
https://cdn.thingiverse.com/renders/73/ ... atured.jpg
Anyway a setup where one uses two sides of the SXT connection points, or a part between the SXT and the pipe, can easely create better pressure angles for the belt over the pipe/tube.