I suppose it's hinged around electrical item generally outdoors, high powered for longish periods and a potential earthing nightmare depending on which wallbox it is. Minor pedantic point, it's not a charger, thats in situ in the car, its a wallbox.
If youre neighbour hasnt chosen a wallbox yet and wants to use the best tariff around Octopus Intelligent they need either a compatible car or compatible wallbox, the only current wallbox that is compatible is the Ohme units. Both Ohme and Myenergi Zappi have built in earth fault detection and dont need any spectacular earthing arrangements. Another consideration is if solar panels are installed, Zappi works readily with solar, it increases and decreases the charge rate in ECO mode to match the excess energy being produced.