mosfets should be close together so they receieve the same current to the gate from the driver. Would it be reasonable to use multiple boards, each with a driver where all the drivers are driven in parallel. Presumably they have a high impedence input and there would not be a timing issue between them. Stacking for power would be HUGELY markettable and allowyou to expand/upgrade/downgrade or take one out that is damaged and drive home.
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