Join Date: Jul 2015
Location: Pennsylvania, USA
You don't have to use the grout, but if not, I wouldn't set the tile (adhere it) either, just lay them in loose. That way, they can be removed to clean the gunk that gets between them out. Spray adhesive onto the plywood underneath could keep them from sliding, but leave them removable. In that case, I'd not use an edging like the Schluter stuff, just a rabbetted wood edging. You should be able make up the inconsistencies in the field and keep the edges flush.
If you do set them, definitely use the modified thinset as mikeswoods said. I'd also recommend pressure treated plywood or a layer of 1/4" cement backer board for the underlayment. For a 1/16" grout line, you'll want unsanded grout and I would consider a polymer additive or epoxy grout just because you may get some flex in the table.