Here's my pro LI install by SMG Motoring in Hopedale, MA. The heads are tied to the grill using zip ties, and fortunally my grill is very flat.
The heads seem to be very stable and are leveled, but haven't tested the install out yet. I got hit with laser today on Rt2, but it was not a direct hit (he was shooting the guy in front of me).
I'm sure as it gets warmer there will be more LEOs out on Rt2.