Dealing with Metal Electrical Junction Boxes
Wireless devices and metal junction boxes do not mix well. A metal junction box blocks wireless reception from most directions, resulting in poor or unusable performance of the device.
If the device is a Z-Wave device, this problem might be resolvable by adding repeaters. Using a repeater, the device can receive signal if the device faceplate is pointing at the general direction of the repeater.
If a device in the metal junction box cannot be oriented to face a repeater or the Devicebook Hub directly, likely this is not a good location to place the device.