I also got hit....arrived in the dark, tired 3am...and did not see the general carpark signs, and it was lashing with rain so the idea of a walk to reception would not have appealed. Complained and Tesla resolved it painlessly. Suggested they add rule to system to ignore Tesla cars for a few hours, as this type of thing is done on other ANPR sites.
They have since added slightly clearer signs, but once bitten twice shy! IT is not about parking there...as the ANPR system detects entry and exit. So in principle you could arrive and wait for a bay for 10 mins and then give up and leave, never parking, never leaving the car, but still get sent a PCN.