I'm doing a total remodel on our bathroom. We took everything out but the subfloor and ceiling. The drawing I've included is my plan for the wall mount faucet. It is a Hansgrohe. I am having the cabinet custom made by a neighbor. The sink will be my creation out of soapstone. And like Hollysprings said, I had the plumber work real close with me to get the measurements in just right, (keeping my fingers crossed). This bathroom has historically been used as a mud room too. It will continue to be a multi purpose room on our working farm. That said, I wanted a wall faucet for glam. I wanted a sprayer too. I wanted a nice looking laundry sink. So, I designed all these into one. Here is the drawing of what I came up with. and a photo of the rough in. As you can see the rough in for the faucet is to the left and hopefully at prescribed height :) The copper on the right is for the sprayer (an expensive luxury from Kohler). I have faucet over load. But I want this room to have options with water. I will have a tub too for the kiddies baths. Oh, and I can access the plumbing from the neighboring room's closet if I need to in the future. Like Hollysprings said you marry this faucet, I like that expression. But we install showers this way so why not.

We installed our wall mount on a new wall, so we didn't have to open anything up. As enduring notes, showers are installed in a similar fashion, so the concept isn't new to experienced plumbers. I love my wall mount, and they are valuable space savers, particularly if you have a shallow vanity/counter, which is my case.

I probably wouldn't bother is I had a full depth vanity and if it would mean opening up an existing wall.