Tilework, yuck. I never enjoyed the messiness/gritty feel of the mortar and grout. Like you, I much prefer working on cars.

You have me questioning myself now. I mounted mine on the inboard but I don't think it should matter too much. As long as the calipers are floating as they should, wear should be almost equal. Once the sensor is actuated the brakes should be checked but there is usually enough leeway to allow for 1-3k more miles of driving.

Have fun with it.