@RaceTrak I rather suggest modifying your existing (AC1300) Deco mesh, assigning Wilma as SSID to your main network, and Fred as SSID to your guest network. After that, you can add the 3 Deco...

@SeoRocker As you observed, in Router mode, the main Deco cannot see any satellite Deco on the Ethernet port used for the connection to Internet. One Ethernet port of the main Deco must be dedicated...

@GeoffT If you have no free Ethernet port on a Deco, then you can indeed connect a switch to a Deco and connect other devices to the switch. What do you mean by "Deco WiFi"?

@Tommy61 The Deco does not require the app to run. The app does not require Internet to work. "network also goes down if Internet is lost": more a bug than a feature.

@i3yron There is perhaps a way to create a mesh with your Archer and your Deco, look at this: https://community.tp-link.com/en/home/forum/topic/704874. If this is not possible yet, it will perhaps be...

@Pattie Regardless of its mode of operation (Router or AP), the Deco will broadcast its own wifi network. If you do now want "to re-set all my wireless stuff", you can simply configure the Deco with...