Has anyone got their house wired who leaves their baby with a nanny alone?? Does it really help?

I have been wrestling with this decision for weeks now and I'm still undecided. So far I'm leaning towards not, because my sister pointed out that putting a cctv in will mean I will see each and every tiny mistake and it will just drive me insane and I'll end up firing each new nanny I hire. On the other hand, it depends on your lifestyle as well. If you're out the whole day, it's good to have a cctv for your comfort.