The extra RBR50 router can be connected as an Access Point, as long as it is connected with an ethernet cable (from the WAN (yellow) port on the RBR50 to a LAN port on the existing router or satellite. This is typically impractical.
And, if a person is physically able to connect this extra router with an ethernet cable, it will function exactly like a dumb "access point" from any vendor. It will not "integrate" into the Orbi network. Devices will not "roam" seamlessly between this access point and the primary Orbi system. In other words, it is a frustrating use of an expensive device.
Provided the ethernet connection is actually possible, there are specific situations where deploying the extra router "is not too terrible." For example, if there is an ethernet cable connecting the main house to an outbuilding where network devices seldom move (maybe a studio, garage door openers, irrigation controllers, TV's, security cameras, etc. etc.) the lack of integration is not a serious problem.
Sorry. This question comes up almost every day and the answer is always the same. Netgear did not design "routers" to function as "satellites". Perhaps they could have, but they didn't.
