When I was Granny charging people recommended a socket from Amazon so you could program it to come on at cheap rate times.
I then bought a proper extension lead that can carry an EV charge, drilled through the wall and put it in the socket.
YOU MUST NOT CHARGE MORE THAN 10 AMPS, cheap Chinese chargers come with 13 amps as an option.
The extension lead is 10 metres and is in that box on the left with the Granny charger padlocked to it.
I put the box over there so pedestrians can't see it when walking past.
If this info is useful I can link the parts.