I've fished out of carpeted boats and un carpeted boats.
Catfish slime on carpet not that much of an issue.
Shad guts, scales and such might need a little scrubbing with a stiff bristle brush .
I keep a cutting board (12 x 12" plywood)to cut bait on in the boat, when through cutting wash off the board and wet and wipe any areas that you mistakenly got on blood on .
Most things will spray out if you don't wait a day or two to do it.
Paint on plywood won't last that long , a solid base stain that penetrate the wood would be better.
The truck bed coatings would most likely be slick when wet or slimey. I'm not sure how they adhere to wood.
Rubber mats are good but added weight.
For the money and time spent I'd go with the Astro turf type rubber backed carpet.
I use the spray glue in the Can, cut the carpet and make sure it fits.
Then roll it back and spray the glue on the plywood and the back of the carpet.
Let it set as required per the instructions (a couple of minutes ), then roll the carpet back in place.
I always allow enough hang over along the edges to wrap the carpet around to the back side of the plywood helping hold it in place. When dry , run a few screws through the plywood into the boats ribs.
Or it can be left in screwed to allow washing out the bottom of the boat.
I always screw mine down.
Simple job, just takes a couple of afternoons to complete.
Carpet is a lot cooler during those hot Summer days than the metal or the wood.
Plus it provides traction.... but being a Cat , that shouldn't be an issue for you . LOL