From Boonies post.
“We use a special marine adhesive to hold all of our outfitting in the boat.  It keeps the lines clean and prevents stress cracks caused by hull flex at hole locations.  It also allows us to put in custom attachment points for gear at customer specified locations.”
So glue in a piece of wood and mount to that.  I have paddle clips and battery holders and fish detectors all mounted on small pieces of wood that is glued in with Amazing Goop.  I can remove any of the pieces of wood in about 15 minute with a putty knife.

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