[LAU] OT: Overvoltage protection aginst lightning for audio studios

Sorry, this is OT regarding to Linux, but not for audio in general and perhaps it could protect some people from the list against a popular misconception about lightning protection. Does somebody know how (in)effectively overvoltage protections for wall sockets in pre-WWII residential buildings are? I suspect that were I live, will be no pre-protections. It seems to be that a concrete-footing ground electrode and ground fault interrupter were the only things that were retrofitted and btw. I'm even not sure if the concrete-footing ground electrode isn't just a fake. AFAIK know consumer wall socket overvoltage protections are completely useless, when living in a pre-WWII residential building. Does anybody know if there's a way to protect equipment against damages by lightning when there are no pre-protections? Regards, Ralf