Hi @Steve-ELC, do you have a Meraki MX on your network and with it the Advanced security license? You could enable content filtering (Proxy avoidance and Anonymizers) and definitely enable Safe Search.
I would also look at Cisco Umbrella SIG
And if you’re dealing with children also look at Securly. I deal with a ton of schools and they rave about this one.
Darren OConnor | doconnor@resalire.co.uk
https://www.linkedin.com/in/darrenoconnor/
I'm not an employee of Cisco/Meraki. My posts are based on Meraki best practice and what has worked for me in the field.