Have a big house is not a good enough if you have a low security level. I know you have a money to hire more than 1 security guards but hiring is not the only solution if you blend it with technology. What I’m trying to say is it will be more better if you combine your security level with a technology stuff.
I’m not asking you to get a Polycom Video Conferencing Systems but you should have something that looks similar like it. A stuff that capable to show you what is actually happened in your front gate. Walkie talkie maybe good but conference system or camera video will be more perfect. Definitely you can communicate with your guards live without any distraction.
By the way, invest for your house security level is one of the best investment. Secure and safe is a something that you must have if you are a big businessman. People always take an advantage with you, so the bad people too….!