interesting video where they perform a test on various poe surge protectors
Interesting video.
I conclude that a good ethernet surge protection costs over 100 € - in the price of RB.
Then what’s the point of complicating, we buy a spare RB instead of a Surge protection.
The backup can also be useful when other problems arise.
best surge protector sofar = 2x 1gbps media converters connected with 1 meter of single mode fiber 
… powered by? Don’t forget that power adapters are “guilty” of quite many surge damages, overvoltage can pass those as well.
An independent review my ass…