Mounting batteries under console - 75 SF

[Cape Codder]

Hi Guys, I mounting two batteries under the console on my 75 SF. My question is what's the best way to secure them to the deck?

The fuel tank hatch runs under the middle of the console but there is about 10" on either side that I could drill into. Interested to hear how others have done this and if there are any gotchas to be aware of.

FWIW the boat is completely original.

Thanks!