@JasperNLH I am assuming you have modem/router, otherwise you wouldn't be able to connect three Ethernet cables to it. With that assumption, what you want will work - with Deco mesh running in Access...

@Flikka If you can manage to bring powerline link to garage, you would not need WiFi mesh solution. 150 meters is a long distance even for powerline link, so make sure you get powerline adapters from...

@Rickyboy If connection is working, it means router WiFi is still on. Power off all Deco units and if router SSID still working - that means its WiFi is definitely on.

@Rickyboy @ImtiazAli is correct, but with Deco M5 you can override this and can configure daisy chain connection. See Part 1 of the following document: How to select a preferred signal source on the...

@mlj With Deco mesh running in Access Point mode, you can connect Main Deco to either router (Archer) or to the switch. That will put Main Deco in Ethernet backhaul mode, assuing switch is...

@Rickyboy If you configured your Deco mesh to run in Access Point mode, you shouldn't be changing your ISP Router configuration. There is no need for that. Just turn off Router's WiFi, that's it....