Your first line of defense is at the electric meter. Here, most voltage spikes transported by power lines can be reduced to a safe level right where it enters the building.
A panel-mounted surge suppressor installs at your electrical panel. It instantaneously responds to high voltage shocks to prevent damage. This product will help protect your major appliances. However, not all power problems originate outside the building. To protect your electronic equipment such as computers, you need additional indoor outlet surge suppression, such as plug strips available at local stores.