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If you're router has a failover DNS option, usually listed as DNS 2, I would set something like quad 9 as your backup DNS. Address is 9.9.9.9.
If you don't want to do that, then having a second instance of pihole running as the secondary DNS is pretty much your only good option
Umm, yea, if your DNS server is offline, how do your machines know how to resolve DNS names to IP addresses?
Which is why IP config has the capability for multiple DNS servers.
If this is surprising, you may wanna read up on your networking.
What are you asking? It sounds like you need some sort of HA (high availability)