It took me ages to decide where to mount it, once cable ties to my home made bracket I placed foam sound deadening in strategic locations to prevent unwanted rattles. Touch wood it's been great.
Good to know. I have a extra roll of Dynamat from when I built my home theater room so I thought I would use what I have left for the car. Since I'll have all the panels off anyway I thought it would make sense to deaden the road noise too.