It is insane that the installing sparky ran three-phase power to the location but doesn’t bother running some twisted pair for Ethernet at the same time.
We had to fight with the installer to have our Solar Inverter connected to Ethernet, even though there was a cable already in place. Unfortunately we won the fight for the Inverter but lost the fight for the PowerWall.
I know that at least one Manufacturer who is deprioritising warranty claims on “smart” Car Charger wallboxes unless they were connected by Ethernet at the time of installation.