Google services

This really depends on what kind of services are you using from Google.
In general, don't be surprised if you run into (unexpected) issues if you block too much (even it may work for some time).

But on this site: https://support.google.com/work/android/answer/10513641?hl=en it's already somehow described what kind of URL's and ports are used for what.

Also keep in mind that you may need openings even you think you don't use/need it because a used app uses a Google service (we had this with the firebase thing for example or like the push service) in order to work.

Also need to mention the remote control is something from Soti side not from Google, so in that regard, even you would allow it via network, you could block it by user permission inside the MDM.

I really understand this whole thing but our experience says: better allow it, otherwise you will by sure at some point into issues when the system grows.