Network UPS Connect (NOT HOST)

I've been searching and most of what I've found suggests installing NUT, connecting the UPS to the Proxmox server by USB and using that as the UPS host. This is not what I want to do.

I have an existing UPS (APC) with a network card and have several other servers running off it (it's big) that all connect by network. I would like to add Proxmox as a connected server, so network shutdown will work on all devices without a USB connection. Can anyone make a suggestion on how to accomplish...

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