Can things like lightning arrestors, suppressors and “whole-building protectors” protect my structure?

Not really. Things like surge protectors, arrestors, & suppressors are all very important parts of a full system, however they cannot protect a building from a direct lightning hit. Lightning Suppressors, Arrestors, & other protection equipment are best used in conjunction with a quality lightning protection system (which may include air terminals, grounding & bonding) if you’re looking for 100% total lightning protection.