The Orbi app supports as many separate Orbi systems as the user wants to manage. Use the bottom menu item, Set up New Orbi System. One account: multiple systems.
Of course, an Orbi system can be added to the app only when the device running the Orbi app is connected to the Orbi WiFi. (A little awkward if these three houses are FAR apart.)
Of course, a person could always load the Orbi app on three different smartphones and create three different Netgear logins...... Nah. What's the fun in that!
