This is a "big flat surface" designed to go on the outside of a modular game table with magnetic rails. A couple warnings - this requires a good amount of sanding, positioning this project for supports is a bit wild, it will consume a large amount of filament for supports, and you'll probably want a brim adding to the sanding burden.

I am no expert on supports though. I also had to do a lot of sanding on the little nubbins that contact the top of the table so they were smooth and not overly tight. Don't damage your table.