Here is a recent map of my zigbee network. The router in the top left is my xbee. The routers twoard the bottom middle are my 4 sylvania smart plugs (non A version). All but 5 of the endpoints are xiaomi devices. A mix of motion, door, water and temperature sensors.
As you can see they are routing fine through my plugs. Been this way for a month or more now with very few issues.
My hub (the C) is actually sitting in a corner of my basement. My Xbee is in my office on the top floor. The plugs are on the main floor and 1 upstairs so the mesh is pretty strong.
Also I think the plug requires a driver to be installed. I took the driver from smartthings and ported it over easily. You should be able to find it on google.
