IMHO, get the SECO unit ($6/month), it comes with several smaller units to use inside for electronics. If you do not get enough, you can go to any of the big box stores and buy additional ones (make sure these are UL listed for SURGE protection and not as an extension cord). From first hand experience, we had a close in strike (heard it, saw it, felt it all at the same instant), it did several thousand dollars in damages to the neighbors, no apparent dame at ours, SEDO unit installed.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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