wall mount isolator valves

[Robbox]

I'm fitting a basin with chrome trap and I wanted to fit isolator valves to the H&C pipes. I found these nice looking chrome valves 1/2" to 1/2" that look like they will finish off the job nicely.

But I'm a bit puzzled how to secure them to the back board that holds the basin. I already have two holes for the incoming H&C, but it looks like I need something else to fit on the back to secure these valves.

 

[Dan Robinson]

The chrome trims tighten to the tiles.

 

[picasso]

Your valves are normally wall mounted using these...

and buried in the wall.