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Its easy to mount wood to anywhere on the hull and it will hold. What you need to do, is place the wood where you want it and drill the required holes through the wood and the deck. Then enlarge the hole in the deck to about 1/4". Next take an allen wrench and chuck the long end into the drill, and the short end into the drilled hole, and ream out the foam under the hole. Then inject epoxy into the hole from a small squeeze bottle. that`s it. drill into the new epoxy, when set, and your screw will hold well.
We had a discussion here about using Gorilla glue instead of epoxy, as it is some form of epoxy, that reacts to water to cure, and it really expands when curing, ensuring complete filling of the void obtained with the allen wrench. It also can be drilled and holds screws well, but first you must inject a small amount of water into the hole, that is unless your foam is water saturated. I think next time I might try using Gorilla Glue(for mounting wood to fiberglass, which is the glue I used building the console. The pieces must be immediately screwed together, as the glue expands in a couple of minutes, The excess can be sanded off later. If using Gorilla glue to fill the void you need to apply tape over the hole and a weight or your finger to keep the glue from expanding out of the hole. and don`t use much glue, you don`t want is mushrooming out of the hole. With epoxy you don`t have to worry about this. but you need to get 2-part epoxy (slow set) that is runny and not thick. Its available from Home Depot.