A:Answer Hi! Yes, you can use it in either Router Mode or Access Point Mode configuration options.
For Router Mode, we would suggest configuring your existing router + modem in a "modem-only" state, or "bridge mode", so it operates only as a modem, allowing the Deco to become your primary router.
For Access Point Mode, you can leave your existing modem + router as is, then configure the Deco in access Point Mode. Please note that in Access Point Mode, some features that are exclusive to Router Mode will not be available.