I've started building a workbench; the top is laminated 8/4 hard maple, face glued, finished at 3 1/4" thick and 28" x7'. Legs will be Nodin adjust-a-bench. I'm about to attach the front and end vices and the legs. Ignoring the leg placement restrictions necessary to accommodate the vices, ls there a "golden rule" of sorts regarding leg placement? Although I don't expect the top to sag, is there a certain placement that equalizes the likelihood of sagging outside of the legs and between them?