Sadly, I can't tell you from personal experience but there is nothing like a properly mounted helmet camera to put you in the driver's seat.
You are riding with Christopher Mies in and Audi R8 LMS during the 2016 Liquid Moly Bathurst 12 Hour week end. Turn up the volume.
The ideal placement for a POV camera is as close to eye level and as centered as possible but, unfortunately, there are no perfect mounting solutions out there at the moment. There are accessories for other positions but, mounting the camera on the side of the helmet doesn't look right, on top is too high and on the chin bar, too low.
The best spot for a POV camera is on top of the visor in the middle. Marshall Pruett came up with this placement and method, aided by abundant gaffer's tape to produce the great POV videos that occasionally appear on Racer's web site.
I've used a modified version of Marshall's mounting technique involving 3M Dual Lock tape and the GoPro upside down to line up the lens even more. Obviously this is particular setup is adapter for a closed car where you might keep your visor open and not ideal if you need to close it.
Perhaps someone out there knows of a better way or might like to step up and design something that will work better because this IS the sweet spot for in car POV shots.