If money is of concern just get the cheapest pad available that'll fit your table. I guarantee that using the mouse directly on the table will feel terrible, veneer/enamel or not.
Tracking may or may not work properly and if there's any type of inconsistency in the table you'll notice it immediately, and drive you nuts.
Atleast for gaming. For just office work it would probably work fine.
Cutting your pad may or may not work. I recently cut my ROG Scabbard xxl and its fine. YMMV.
Close the world, txEn eht nepO.