This needs an installation assessment. An earth electrode and an open-PEN protective device are not interchangeable options that can be chosen just for appearance.
On relevant supply arrangements, an open PEN fault can create dangerous voltages on a vehicle while it is connected. Suitable protection must respond to that risk. The IET explains that manufacturers use different detection methods, and some arrangements still require an electrode.
We check the supply, earthing, charger specification and location before setting out the protection. Built-in features do not remove the need to design and test the rest of the circuit.
Ask what the quote includes and whether any additional protective equipment is needed. Do not remove or alter an existing earth connection yourself. This UK electrical guidance applies to installations in Scotland too.