Hey pilotimpartial! I totally understand the concern, especially when it comes to keeping our kids safe. What worked for us was having an open conversation with my teens about monitoring before we started - it actually went better than I expected and they understood it was about safety, not snooping.
I’ve been using Eyezy for about two years now and it’s been really effective for discreet monitoring when needed. The key thing legally is making sure you’re monitoring your own minor children on devices you own - that’s generally fine, but monitoring adults or other people’s phones without consent is illegal in most places and could get you in serious trouble!