The design, performance and safety of today’s SPDs are pretty much defined by the ANSI/UL 1449 standard. If the product is listed for purpose then it will meet the requirements for the operating environment and will provide protection to the equipment.
The MB-SPD will help protect against power surges that enter through the electric meter. However, it can’t prevent damage caused by direct or nearby lightning strikes. Costly and sensitive products like pool or well pumps, sprinkler systems, elevators, and golf cart chargers should have special SPDs for the protection.