I've been using the RCT715 with a BUP mount attached to the saddle rails. On the roads I ride in my area, most plates are note readable, even in good light at 1080P, because of all the jitter. Maybe the OEM mount would work better, but I don't quite have the space to accommodate it well.
I saw QuadLock has a stabilizer mount. It is marketed for motorcycles, but the form factor seems like it might be workable. The issue is the mount interface. Any idea on whether it would be possible to attache the Varia using the quadlock system?