I drilled the benchtop for four as shown in the Schwarz blue book, then later added holes in a single row to line up with the end vise' pop-up dog. Then three each on the front legs and that's it. Haven't wanted more holes in the top than that, and the leg holes hold the holdfasts.
Now, use the words butt, hoss, bullocks, fetish and friggin' in a single, interesting sentence… bonus points for mentioning mc hammer…