I think I tank mounted it on the Sprint but have used it on the touring screen on my R1200R. More recently I have bought a Manfrotto arm that allows me to mount it to a bit of frame or footrest hanger etc and position it almost anywhere. One day I'll actually use it an do a video on it with my Insta360. there are some good videos on this setup that you might want to search for. Let us know how you get on.
There are very few mounting options on the R1250RT. Going to try the suction mount onthe windscreen....Have you tried this?
I think I tank mounted it on the Sprint but have used it on the touring screen on my R1200R. More recently I have bought a Manfrotto arm that allows me to mount it to a bit of frame or footrest hanger etc and position it almost anywhere. One day I'll actually use it an do a video on it with my Insta360. there are some good videos on this setup that you might want to search for.
Let us know how you get on.