Anything behind the front 1/3 of the hood is (in most cars) a high-pressure area of the exterior. Which means that you may actually end up feeding air back under the hood - probably won't happen, but what also probably won't happen is venting any air out from under the hood. My guess is that unless they're nearer the front of the hood, you won't improve cooling efficiency, but you may hurt it.
Looks are another matter, of course.
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