Here's another thing: faulty (or worn) surge protectors are said to be fire hazards. This has been reported since the 1990s. Here's a Consumer Watch story. It's a good idea to replace them every few years.
Picture: The "Hot Sticks" were purchased at a 7/11 before a 2010 blizzard, before the generator. The chimney actually had some damage from the earthquake in August, about $3000 in repairs.
What about smoke detectors? Yes -- have them as part of your security system. (I had one in Dallas send false alarms in 1987, though.) Sprinklers? I'd be afraid they would go off on false alarms and do property damage. But I had one in New York City as early as 1974 without problems. It wasn't a choice in a rental.