My son is making a live edge slab dining table and will use metal legs made from 1 inch square tubing. I can think of two ways to fasten the legs to the slab one being lag screws and the other being threaded inserts. On both i would use oversize holes in the metal to allow for movement. Any suggestion for another method and recommendation of one of my ideas over the other. Also if using threaded inserts should I epoxy them in place or just rely on the threads? TIA