Here is the page that tells you what you have access to with the subscription: https://fishingstatus.com/subscribe/usage
Some spots have more info than others, but you would need to click on the title and go to the details page if the spot to see all available info.
From the Download Fushing Spots page, which is linked heavily throughout the site, on the map pages, as well as the link above, you can download by many different options, including structure types like reefs, rocks, or wrecks, which would satisfy your "bottom fishing" requirements.