Just for the record/JFYI, besides “normal” power lan devices, devolo makes also a device that I have not seen by other manutacturers, a sort of central (three-phase) hub/injector that may offer some advantages, see:
http://forum.mikrotik.com/t/hap-ax3-wireless-problem/172468/129
https://www.devolo.global/magic-2-lan-dinrail