I used Kaspersky Parental Control, but my kids broke this and They could use how they want. The best way is in Parental Control system like Synology has. All programs above will not give better protect and functional. For example Synology Mesh 2200ac works in bridge mode and than is able to turn on Safe Access to Parental Control. In my opinion is the best now. I tested a lot of programs and any other .
Regards
Sounds like you have smart kids.
I earlier recommended Norton Family, but now that you mention your experience, it reminds me of a few important points about Norton Family:
1 It cannot monitor Edge Browser. (workaround: disable firewall access for Edge, for instance, by means of Comodo Firewall, and wildcard the path, so when Edge updates, the block will still work.)
2 Put the kids on standard user accounts, not admin accounts, so they can't turn Norton off.
3 Install the browser extension/add-on for Norton Family, so it can monitor within secure connections.