Thank you for your reply.
We are already using URL Filtering to block overall internet usage, but that blocks for both mobile data and wifi, that's why we also have google domains on our whitelist.
Another question related to the URL Filtering plugin (we are on the enterprise plan from our parent company), users cannot open websites based on IP, even though the IP is on the whitelist (websites like local network 192.168.100.0/24 or, more specifically, 192.168.100.1). Is this intended behavior or are we doing something incorrectly?