Honestly, yes, a voltage spike guard of some kind IS good, no question.
Even better, though, is an UPS unit. Mor expensive, but they guard against voltage spikes, power failures, lightning strikes, any form of power problem. There's no direct connection between input and output, so any power troubles can't get to your equipment. They also give you a little time, how little depending on the quality of the UPS unit, to get things properly shut down in the event of a power outage. Your computer, monitor, moden, whatever.
No computer system should be without an UPS. MY personal policy is "If it's much more complex than a toaster, it goes on an UPS." TTV, Sound system, Router, computers, you name it.
A small side note: Laptops have a built-in UPS, as long as the battery is good. Just a head's up
Good luck, Chief! My father-in-law is a retired Master Chief, BTW. We have a good ol' time when we're together in the same room
Pat☺
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