Suction cups are surprisingly good, i have seen them holding at speed on the track. I was wondering the same thing as i am thinking of tobogganing with the kids today, i don't want to buy a helmut to mount it but would like to have it on while tobogganing.
I guess there is a gead mount i could where over a touque.
For you in hotter climates a toboggan is a craft used for sliding down snow covered inclines, a touque is a warm head covering to wear while doing such an excersise.