Here we go. Had some issues initially because this tile is "hollow" on the back and running thin-set parallel to the long edge was trapping air behind the tiles and this would cause them to pop out after pressing them into place. I found that if I ran my notched trowel "vertically", the air would be forced out as I set them. I knew if I got a good "hiss" as I set them that they wouldn't pop off. This will be a groutless install so I'm setting the tile as tight as possible, with some persuasion with the rubber mallet.