@TP-Link_Deco Thanks for the reply. Question1+2 are clear now, thanks! Question 3 on classic powerline adapters less so I am a bit confused how you talk about PLC backhaul I assume PLC backhaul is...

Hi, i'd like to set up a mesh network with a backhaul - wired where a ethernet cable is availabe - powerline if there is no ethernet so i was thinking about a few M4 or M5s + P9's for the locations...