Correct Adguard DNS setup


Occasional Visitor

I have a unifi setup and have AdGuard running on the same machine as Unifi Controller.

At the moment, I have applied AdGuard at a network level by setting its IP address as the Primary DNS Server within the Unifi Controller WAN Section.
Secondary server has been left blank.

On the odd occasion where the machine running AdGuard/Unifi Controller needs a reboot, this causes all internet access to fail as the DNS hasn't got anything to point to. How should I configure this to bypass the AdGuard machine if it has crashed or in any way failed?

Thanks in advance.
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