I have the wheeler wrench (similar to the NSS). I removed the handle and bolted it to the bench from the bottom (handle side) with 1/2-20 grade 8 bolts. Using slightly less than 1/2 of the threaded hole depth. My bench is 1-1/2" thick so 2-1/2" with flatwasher leaves about an inch of usable threads for the clamp bolts. The bolts that came with the Wheeler were 2-3/8" and the clamp is about 1-1/4" so I used a couple of flats on the clamp bolts to prevent them and the bench attaching bolts from touching each other when the clamp is tight.
It ended up very solid and have used it on the toughest of "gorrilla" applied nuts.
Randy