I'm planning a shower/tub renovation. I'd like to have a rain can shower head in the walk-in shower. The arm would extend about 16" from the wall. It's been suggested to me that that could cause the pipe to vibrate and it may be better to have the pipe extend down from the ceiling. Has anyone had experience with either of these set-ups? There's really no reason not install the ceiling mount...we had the correct electric switch installed for showers ...but it will cost more to install the ceiling mount since that will entail both plumbing time/materials and sheetrock repair. Thanks so much.