I use a Garmin Virb Ultra 30 .... I have it mounted on the handlebar using a K-Edge aero mount on the handlebars (together with my Edge 1000)

however, I also have a helmet mount, and I find that when I have it on the helmet (ontop where it is visible to motorists), the motorists are very polite and give me lots of room when they pass

I also use a Cycliq Fly 6 rear camera but most motorists think that it's just a back light