Prevent "Standard/Unified" RED10 from accessing devices in local network

Hello everyone,

I just added a RED10 to our UTM9 and chose Standard/Unified mode as we need the remote office to be working via the local office's public IP address.

However, the remote office's clients shall not be able to access devices such as servers and NAS that are operating in our local network.

My question is whether creating the following firewall rule will be sufficient or not.

RED10 (Network) --> ANY --> Local Network (Network) --> DROP

Will this work out or will it prevent the RED from working correctly?

Thanks a lot in advance!

Best Regards

Sebastian