Slab over tile

I've got a floor coming up and (http://maplered.com) the plan is to set six Slabs (http://www.VerdeUbatuba.com) of marinaci green over ceramic tile. The tile is set directly to concrete with thinset and (http://maplered.com) has a good bond. Im wondering if thinset is the way to go to bond the Stone (http://g603.net) to the tile. The Slabs (http://www.VerdeUbatuba.com) have glass backing if that helps.
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Chris Freeman, SFA
Freeman Granite & Marble Inc.