@Faratharr You can buy another Deco kit of 3 and add it to your Deco mesh that already has three units. TP-Link states you can have up to 10 Deco units in Deco mesh. More about it here: How many Deco...

@rob--nl Why have you decided to add P9s, instead of adding M5s: do you have use of powerline backhaul on P9s? What you describe may be related to low quality electrical wiring, or high levels of...

@NickBB Have you tried the following test: power off First satellite unit and see if Second satellite unit can actually connect to Main unit using powerline? You may find that Second satellite unit...

Cardifftomo wrote i was looking at the x60 as says coverage of 70.000sq ft @Cardifftomo I think they meant 7,000 sq. ft. Be skeptical to what WiFi mesh manufacturers claim for coverage. It is like an...

@Cardifftomo With your setup I would recommend Deco M9 Plus. It looks similar to M5, but slightly larger. It provides better WiFi signal. I know that for a fact as I run mix of M5 and M9 Plus in my...

@DaveP67 If you have Ethernet cable connected to your home network, there is a simple solution. Buy single Deco unit, such as Deco M5, connect it to Ethernet cable in your extension. That Deco unit...