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Unless you are stopped, putting another obstruction(the fan) in front of the radiator for air to go around isn't going to help.
There's also the dead air space right behind the fan's motor. Unless you build a proper shroud and mount the fans several inches from the surface of the radiator, you'll still be faced with dead spots.
The ideal setup is to have a single, large, speed modulated electric fan mounted behind the radiator, with a shroud completely sealed to the core, and flaps that open when the incoming air speed exceeds the fans capacity. Packaging constraints prevent this kind of setup on most vehicles due to the large plenum needed.
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