Panel switched back on fried garage door opener (need surge protector)
The most common surge arrestors are MOV (metal oxide varistors).
The one you linked will protect a single circuit but the power issues need to be fixed first or it may fry the unit (more than a 600 joule spike and the let the magic smoke out).
They work by dumping spikes to ground but they are limited in the power they can dissipate.
They also make larger units that can be installed to protect the entire house.
breaker style I put a larger one in that required a external box and a 20a 220 breaker to feed it after that I quit having equipment not on UPS's fail. (we did have very noisy power in that house because of the industrial loads down the street).