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I respectfully disagree with the idea that an airdam should only be as low as the lowest underbody components. There are practical reasons for doing this (clearance), but it's easy to find examples of aero-optimized cars (Volt comes to mind, as just one example) with deeper air dams than their dangly underbits.
There's an advantage to doing it in 2 steps:
1) cover the grille holes
2) make an air dam that attaches to the factory bumper beneath, but extends further down & wraps around the sides
That way if (when) you hit the dam on something, you only have to straighten out that portion.
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