Shower elbow wall plate. plumbing advice

Shower elbow wall plate. Hi, best way to go about fitting these? The length of thread means the back plate elbow is deep in the wall for the square shroud to fit flush with the tile.

Is it best so sit the back plate elbow forward and trim down the Brass thread ?

Regards

Shower elbow wall plate. to read more on the original thread at Plumbing Advice

See also UK Plumbing Advice for all UK plumbing advice needs.