This is a better view of the tile space testing. It all seems to be fitting together nicely. Very thankful for square walls.

This is a closeup of the Schluter Ditra. The thinset fills the little squares and is combed to 1/4" on top with a square notch trowel. The tile rests in that thinset. Hoping to get the tile down this weekend. The laundry room has become a phase 2 project.