It seems like you really want to do this, regardless of what info people are posting here... so just do it then.
Post pics when the dealership screws it up though, like all the contaminants that will be stuck under this material when they don't wash/clay/polish the car properly.
If it's taking only an hour, I am certain they will just wash the car and apply this material.
'11 BMW E92 ///M3 - ZCP and DCT
'15 Ford F-250 - Lariat, 6.7 Powerstroke Turbo-diesel