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All air impinging below the stagnation point goes under the car. An air dam restricts the opening to the underbody plenum.
Lowering the stagnation point reduces the underbody air. Splitters offer downforce because of the presure of the downward-moving air, but they can offer a new stagnation point.
IIRC there is some advantage to a stepped air dam, a 45 degree bevel at the structural member and a fill plate to the bumper/splitter.
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