I just installed the exact tile over Ditra Heat. I had to DIY as most installers/contractors I spoke with were overwhelmed by the combination of 'new' products and would not touch it. The others were 'I'll give it a try'. Umm, no. I did a LOT of research and did use penetrating sealer before grouting w a matching/light (standard white) grout. The Tile Shop (store name) tried to sell me grey grout. But I knew better thanks in part to these forums.
I just found this post while searching for wax type/brand to top finish and maintain. Thanks Villa Lagoon Tile for all your advice! You all are the best.
I would love to see your solution outcome!
Q