So I use a 17" Walmart  “Onn” soundbar for local sound, I was using an old soundbar “tray” that I tek screwed into my dual monitor mount. C-C=280mm, 9.5mmDIA. w/ 3mm embedment. I just used two self-tapping screws I had in the box for the compression clamp, feel free to change it to your liking, .sldprt is included.