I don't have a full dresser, so the one time I "needed" the help of my Smartphone's GPS, I was worried that I might need to leave it out in the open, so that the satellites could find it, and tried riding with it between my legs, on my seat.
Fearing that I might lose it, I stuck it in my jacket pocket, using ear buds, and amazingly there was no issue of lack of tracking trouble.
So for ME, mounting it is not a concern.
That said however, I had bought a Wilson Mount for a truck I owned, that worked just fine, for $100.00. I'm willing to bet that it would work on a bike Fairing just fine.
2013 HD FLTRU103
"Who SAYS your smarter, just cause you're older?!" -SDC