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Look at the Sunraycer. The shape is an an aerofoil and about as ideal as you can get. It's not the same top and bottom so it almost definitely creates some lift. But it's more aerodynamic than if it were shaped like a flat brick.
You could make it neutral by shaping the top and bottom the same, so that the forces on the top and bottom equal out... But that wouldn't happen while it drives along on the ground, because you'd be compressing air underneath. You could curve the bottom just enough that it evens out the top's bernoulli effect after you factor in ground effect.... But you'd also be increasing drag beyond a flat bottom because it takes energy to compress air.
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