I have used the Netcomm NP204 in a set of 4, but I believe they allow you to go up to 15
Usually once you pair the first 2, there is another setup procedure for adding more into the same network for the NP204s you have to Hold the simple connect button for 10 seconds to reset it push the button on an existing connected device till the light flashes push the button on the new device, they should pair
Most powerline adapters probably have software that allow you to do the same thing
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