We installed a hand held shower with a short vertical bar.

I bought mine from Ikea. It has a "washboard" in the front, which appealed to me. It's 25 5/8" deep and 24" wide. My laundry room is still under construction, so I can't tell you from experience how well it works, but it looks great and the price was right ($169). Here is a link that might be useful: Ikea Numerar

Don't kill me for doing this to you -- it's pretty grand. But it could be done much more simply. It does cover the territory, however. Here is a link that might be useful: Laundry Room with Dog/utility Sink

For an under-mount sink, the real depth of the sink is the sink's stated depth + the thickness of your countertop. So, if you have 3cm stone (or 2cm stone + subtop = approx 3cm), then your sink will be 10" + 1.25" = 11.25". Grids raise the "bottom" of the sink by 1" to 1.25". So, figure 10.25" depth for the sink, just to be conservative. Is this too deep? It depends on several things: (1) Your height (the taller you are, the more likely a deep sink will bother you b/c you have to reach farther down than shorter people) (2) Your arm length (the longer your arms, the farther you can reach down w/o having lean or hunch over) (3) Current condition of your back & shoulders...if you already have occasional problems w/your back or shoulders, it may exacerbate the situation if you have a very deep sink. I'll be honest, I'm 5'10" (the shortest one in my family...the rest range from 5'11" to 6'6") with long arms and I would not want a sink any deeper than the 9" one I have (well, 9" + 1.25" - 1" grid = 9.25" total depth). Mocking it up is a good idea, however, you really need to use it for an extended length of time to see if it will eventually bother you (you might not at first, but after a while or over time it may start to bother you or your DH.)