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You can have a 2 adguard home + adguard-sync. Works smoothly.

But what if both fail? :)

The simple answer is have 2. If the cost per unit is low enough than deploying 2 PiHoles is trivial.

The developers could make users' lives easier by implementing a clustering option that syncs the 2 out of the box. For static deployments, where you don't change the config too often, it's still decent as it is.

I did the same (until my RPi zero stopped working). Both the devices share same vertical IP address and if one ever went down, the other would take over without any delay.

I have my router set up to send DNS requests to my adguard home server, and if there's no response, it falls back to one of Cloudflare's. So it fails-open, letting the ads in along with normal requests.