I have thought about this in the past as this would possible even out the air flow a bit so it wasn't just drawing towards the one vent. However, I have never had an issue with just using the single vent so I figured I would not risk jacking up the lid to install a second.
Proud owner of the PentaZero
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“I dream of a better tomorrow, where chickens can cross the road and not be questioned about their motives.” ― Ralph Waldo Emerson