I protect my home computers by having the internet connection done via wireless, with a pre-configured pre-tested backup router ready to replace the one in use. Electric comes in underground (underground MV to pad transformer and underground LV to home) and goes through point-of-use protection, then UPS, then a couple IsoBar filters (not cascaded). I'm intending to add further surge protection to the panel some day.
I'm still trying to figure out a good way to switch this to 240V L-L.
