If you want to improve your safety you need to start with a healthy dose of perspective, or else you risk wasting all your time, money, and emotional energy in what amounts to a comfort blanket.
Take for instance Mass shootings. Horrific, they have killed what; 273 people this year? If that's what makes you afraid you really don't want to look at the death tool of the common flu estimated to have killed upwards of 50,000 Americans this past season. You and your husband are allowing your brains to blow one miniscule risk out of proportion which, if you are not careful, will take resources from more important risks.
Please realize that you two are brewing a storm out of a teacup but even then, a whole lot of good can come from this: take a sensible look at what you can do better. Low hanging fruit; do you have fire extinguishers on the house and cars? You would be amazed how many homes would have been saved if somebody spent $50 bucks on one. Only 10% of burglaries are planned, most are smash and grabs. You'll be amazed at how effective a light with a motion sensor is, then security cameras, then home alarms. Are you covered there? Are you practicing enough with the guns that are in the house?
If you go out of your house with situational awareness and common sense you would be armed better than most of the population, including those with CCW. This is a skill that you nurture over the years and can learn and practice while spending money on real solutions to more pressing threats.