Self hosted ntfy notifications through Tailscale: a bad idea?

Trying to get server status and monitoring notifications for things like drive failures, backup failures, UPS status, expiring certs, runaway processes, etc. I don't have anything exposed publicly, so in order to get ntfy notifications on my phone when I'm away, I have two options:

1. Use ntfy's servers without signup using a public topic. I don't love the idea of my notifications being public, even if they are hard to find with a random topic name. Also there are some limitations to using their servers.
2. Self host a ntfy server and use Tailscale to receive messages. This is my preference, but I'm worried about the additional point of failure. If my Tailscale connection goes down (on the server or my phone) I won't be able to receive notifications. I usually keep Tailscale running on my phone all the time for Immich anyway, but notifications need to be fail-safe and I worry this would be poor practice.

What's your setup for receiving status notifications from your unexposed server?

https://redd.it/1x015s1
@r_SelfHosted