I use a Contour HD cam on my 2007 ST and my 2015 wing. Its mounted in the same location on both, under the cowl.
I also have a windshield clamp mount that I use. It works but has more vibration. I have only used it on the wing. I suspect the vibration would be worse on the ST's windscreen.
Windscreen mount information.
Here is a nice windshield Mount for your video camera. It is made of 1/8th inch highly polished Aluminum , it has rubber cushions so it want scratch your windshield. The ball Head can swievel in any direction. It will work on either side of your windshield It has 2 set screws that will hold the...
gl1800riders.com
Video with under the nose mount on ST
Video using the windscreen mount.