Lightning arrestors and surge protectors
Surge suppression is done on the power line and is dependant on a GROUND to funnel any surges away from the circuit. Lightning arrestors are devices resembling a spark gap. Both devices are SACRIFICAL. Many also come with a statement of liability and limitations of insurance(some come with a policy). Multiple ground points is a problem in some retrofitted homes and can result in some damage to electronics when interconnecting between devices on different grounds. Yes, a licensed electrician should check out the entire home to ensure no serious conditions exist.