Definitely a shurflow in my RLSA and it is mounted to the exterior wall above the water heater. It's high enough to be placed between two of the aluminum floor channels that run the long way on our campers. I would guess that cavitty amplifies the noise of the pump. I think a one inch pice of styrafoam attached to the ceiling over the pump would quite it down inside the camper. But most of the noise I get is from the vibration of the pump running so I may find a different way to mount it. Looking at my control pannel I have a one inch gap between the top of the panel and the ceiling, looking in that gap you can see the very top of the water pump.
