IMHO and I am sure some on this list will jump on me for thism but,
You are much better off carrying a pepper spray to fend of a would be attacker of whom youy don't know if they would be of bodily harm. .
Within the context of what the OP is saying (home security) instead of investing in a fire extinguisher of OC, you're better off taking that money and boning up your home security. An unarmed perp or some random drunk trying to get into your house can probably be deterred by "adding some shields". It doesn't take much imagination to think how making your house a "hard target" can pay legal dividends on the back end.
-Mike