I have a number of 17/64 holes that go through the table on 5 1/2 inch centers. For small signs I drill a few holes in the bottom of the work-piece at say 11 inches. Thread as desired.

I use a proper length lag bolt to "pull the piece" down. As long as you stay above or beside the bolts it is fine. Entire upper surface is free to cut. Beginners can use a nylon threaded bolt ...