My piles look just like yours, but limited to how high my front end loader can get 'em up there. The pallets provide air flow coming up from underneath. I soak my pallets in old motor oil, which seems to add a couple years to their service life. I've tried piles before without pallets, and it seems that it's not just the very bottom layer that rots, the rot seems to spread quickly on up the stack, particularly with maple and hackberry. I'm ok with the mice, we got foxes here that need something to eat.
Just get the wood in a sunny windy place and you can eliminate all this fancy stacking.
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