How do I put shiplap evenly on an uneven wall?

I’m wanting to add shiplap to The backside of some cabinets but it’s uneven so I don’t know how to do it without having a weird shape cut on the top piece for the bottom piece. I also don’t want any shiplap hanging below because then you’ll see that from the kitchen side/front side of the cabinets. I really hope this makes sense.

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