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Yes, racecars have front spoilers that go almost all the way to the ground; however race cars are not exactly focused on low drag, as they are more worried about stability.
Lower than the lowest existing component puts you interesting place, because you may continue to reduce CD, but you could be adding frontal area. Maybe the CD is reduced enough to offset the gain in area, maybe not. Probably depends on the specific vehicle.
I think as low as the lowest existing component is a good guess for a baseline starting point, any higher or lower can be tested. If a new ecomodder starts out making super low ground scrapers and it just so happens their drag increases and mileage decreases, good chance they will get discouraged with the whole idea.
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