Me too, except I use apcupsd.
I think this line indicates it only has one config index:
So not possible to set a different one as linked there.
But, I agree, this looks like it might be the cheaper device. The TP-Link NIC may well work by setting an alternate config index. @sscleber ?
Ah, yes, if it tries to boot and finds the assigned interface missing then you will see problems. I would not normally expect a panic though.
An Ethernet connected external modem will give far better results pretty much every time.
Response from Netgate Support:
"Powering that device with the USB port should be fine."
Check the bios for any sort of USB power saving features that might be shutting down the NIC at reboot.