Obliged to post; Mounting of bench vises.

[Gary A. Wills]

First I want support , then I check the swivel of the vise and if it's mount with 3 or 4 bolts. I mount them with the anvil over the post to the floor. I mount with the biggest washers or flat stock drilled to match where possible.
I have one of those old round swivel turnable vices on one of my benches. It's been used heavily and keeps taking all I give it. Now on another bench my vice is mounted with the upper jaw flush with the bench. My welding table has a couple mounted so they can be swiveled back wards to match for heavy items to weld up.
So you see really I guess it's up to the type of work it's going to do.