Sorry if this has come up but I couldn't find it. I have an R10000 and R11000 that am getting ready to install so I was researching depth and got stopped in my tracks. The wall is planned 1/2" drywall, floated, and tiled... which comes up a minimum 1 9/16" thick wall(prefer more float but) anyhow, by looking at this valve and diverter, maximum wall thickness is about 1 1/4". Am I missing something? TIA.