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A good lower bound for the airdam is the height of those bump strips they put in parking lots and residential streets. I'm at 2 3/8" to the tow hook and 3 1/2" overall. It clears about 90% of them , but still bottoms out crossing Main Street downtown and a railroad track in Harrisburg.
The young folk in their stanced Jettas run at around 1 to 1/ 1/2" clearance. They must have a smartphone app that tells them when a maintenance crew throws down a steel plate over a hole in the pavement.
One reason to put a relief in the center of the airdam is so it won't high-center on gravel driveways.
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