wall mount isolator valves

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.

 

The chrome trims tighten to the tiles.

 

Your valves are normally wall mounted using these...

and buried in the wall.

 

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