BackEMF,
I think the hub can be connected to an existing network, although it must not have anything paired to it before doing so. See this doc I found on this http://z-wave-assets.s3-us-west-2.amazonaws.com/docs/706/B07D7Q6CHB_-_Ring_Base_Station_-_Manual.pdf?1532938148
Look under “Adding Base station to a Z-Wave Network”.