That's an informative video*. So I went to see if they had done a VW Beetle. Yes, but it's
a five-year old tuft test of the roof centerline.
Quote:
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how much lower the air dam comes down from underside lowest flat points of the vehicle
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Not sure what you're looking for here. I surmise that the air dam should shield 90% of the undercarriage, with local blisters on the remaining 10% to minimize frontal area.
On my vehicle that would be the front tow hook. It stands proud by 2-3".
*Especially Surface Friction.