Nice video. Arthur Bradley has done tons of legwork educating and doing QA interviews on Youtube, just search his name and "EMP".

  > unless... the fuses/surge-protectors cannot cope (unlikely). Hint: buy a Siemens surge protector.

Dr Bradley also stresses flipping your main breaker, as soon as possible (and ideally beforehand). Surge protectors work for short spikes, but constant overvoltage (like the slow-rising E3, which builds over seconds-to-minutes) will destroy them instantly once the grid voltage rises to meet the SPU cutoff voltage.

After many teardowns he does recommend the FS140, but it wasn't a blanket recommendation for all Siemens products. Quality varies across their surge product line, from what I've seen.

https://www.youtube.com/watch?v=TRAJefgdKOU