I currently have a pair of NETGEAR XAVB2001-100NAS Up to 200Mbps Powerline AV 200 Adapters. Can I just add a third unit upstairs (like http://www.newegg.com/Product/Product.aspx?Item=N82E16833122361, for example) and all three ports will have connectivity to each other?
Or do these guys work in pairs only?