Yeah. Unless I purposefully or accidentally mess something up, my VMs run great without interaction. But either way, I usually have to manually change something to create an unstable vm.
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Check your host syslog (it’s available in the GUI) and it should give you an idea of why the VMs are hanging.
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Have you considered a high availability cluster? It’s literally the tool that exists for what you want.
PBS is cool for like a disaster recovery scenario, but it shouldn’t be the tool you go to for frequently unstable VMs. That’d be a fabric bandaid at best, but leaning heavily to a liquid bandaid in practice.
The UPS is a better deal off the better insurance alone. Ignoring the additional feature, you get twice the insurance for the same price.
There really is no downside. The batteries are replaceable. There is a door to do it so even doing so won’t void the warranty or lock you out of support (unless you attempt another way of doing so).
Only thing I can’t confirm is the UPS surge protection power rating (as in how much power above the standard current you are protected/insured against).