@TDawgSmitty Deco M5 has gigabit Ethernet ports. Cat 5E or Cat 6 Ethernet cables should be sufficient. I use Cat 5E Ethernet cables with M5s at my house.

@AndrewF Start with this FAQ document from TP-Link: General Questions about the Powerline or PLC Backhaul Feature of Deco

@ImaginaryTango You can use Deco app to create and manage multiple Deco meshes, but it is for WiFi mesh at your house and, for example, at cottage. Not for running two Deco meshes in AP mode on the...

@jonnyhk You can buy more Deco units and add to your Deco mesh. In theory, any model of Deco can be added to existent Deco mesh, but in real life it makes sense to add most compatible models. If you...

@Jadnavarro If you have single M5, it will behave just like any other standard WiFi router, broadcasting its own independent WiFi network. Your modem will still provide WiFi to devices nearby, your...

@ImaginaryTango You have two Deco mesh systems, both run in AP mode, both on the same LAN. I don't even know if it is supported configuration. I can't figure why would you do that. It is possible...