@Floob Yes, M4 is less capable that M9, but these capabilities that you mentioned come to light with faster Internet speeds. You can try M9, of course, I have two and like them very much, but they...

@Floob For your apartment and Internet speeds you have, I recommend you consider Deco M4: M4 = £99 https://www.amazon.co.uk/TP-Link-Deco-M4-Seamless-Replacement/dp/B07NH1J543 Deco M4 does not support...

@Blobbie With WiFi5 the best you should expect, in real life scenario, is about 400-500Mbps. To have steady consistent WiFi speeds above that, you will need devices that support WiFi6 and router or...

@Boriy If you run Deco mesh in Router mode, you may need to manually increase the value of QoS parameter. See Using QoS feature of Deco Scroll down to Part 2 of that document, where it says "setup...

@MarcoTrevisan You should be able to connect Deco P9 master to the Ethernet port of the range extender, and it will work. But just in case, get Deco P9s from the place with return policy.

@Dips_p Yes, it is that simple: just connect switch by Ethernet cable to one of Deco Ethernet ports, does not matter which one.