I have a Shunyata Hydra 6, and it didn't do enough. A surge fried my amp and my speakers. It's an excellent power line conditioner, but not robust enough as a surge protector.
What was recommended to me, and I now use, is a Zero Surge surge protector. That's all the company does. They're used inside some high end power conditioners and generators, but you can use them in tandem with existing power line conditioners without loss of sound quality. I now plug the Hydra into the Zero Surgem