Best content filtering to block illegal activity on wifi router?

Hello!
We have a little hostel with free wifi to our guests.

Do you guys have any recommendations on how to block illegal activity?

We used anonymous VPN before, but we have problem accessing some normal streaming websites.
So we search for an alternative solution.

I found these solutions:

https://cleanbrowsing.org/ ?
OpenDNS ?

Thank you very much for giving us advice.