Best protection is to have a whole house surge protector at the meter or the load center(breaker box), then surge arrestees at all your more expensive electronics devices in your house ( A/C units, tv’s , computers , microwaves, ranges, refrigerators, etc.) Reason being that surges don’t all enter via SECO system, many originate from nearby lightning strokes that induce high voltages into the home wiring directly, or entire thru the ground into ground wiring of the house. If your handy you can do just about all of these yourself (with a little electrical knowledge). Far less costly then paying to have it done).
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