If you drive with your fuel pump access covers off, you will generally feel very warm air coming in. This is because the air under the car is the air that came in through the radiator and around the engine.
I think that a scoop on a hood is a bad idea unless it is used to feed the air intake filters in a sealed manner. Vents will relieve pressure in the engine bay, allowing heat to escape out the top, hopefully allowing more air through the bumper/coolers while reducing air pressure under the car. A scoop will just try and cram more air in, and if it does, it will probably only serve to increase engine bay pressure, possibly reducing radiator flow, and putting more air under the car.
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