I made a plate for holding 2x of my Pavotubes T8-7X (diameter 28.5mm) at once. On the photos I used some polycarbonate clamps that I had lying around but I also made a clamp from PETG that works as well. In the middle of the plate I used a 1/4" threaded insert to be able to mount it on a ball head or tripod.

Bill of materials:
1x threaded insert ruthex 1/4“-20x12,7
4x M3 x 12mm screws
4x M3 Locking nuts