I've got the Ram mount that goes on the steering stem but I'm not a fan. I have a tinted windscreen and I'm also not a fan of the speedo being right in the center of my footage. I've run one off the side of my helmet but I also don't like feeling it on my head because the wind is pushing against it.
I had a mirror mount on my R1M but there seems to be far too much vibration to run it on the Duc. Interested to see if anyone has gotten creative with their setups.
Best I've done and this was off the side of my lid: