I did a quick experiment. Machine A runs NetBSD 9, ups-nut 2.8.0, and Home Assistant Core 2022.8.4. It has a ups foo. Note there is no "nut addon" involved, or any "addon" at all. ("addon" is a Home Assistant concept for the Home Assistant OS or Supervisor running progams not from Home Assistant.)
Machine A runs NetBSD 9, ups-nut 2.8.0. It has a ups bar. Since a long time, a year or two, the nut integration has been configured on A to talk to foo, over the usual 127.0.0.1:3493. I just set up an ssh tunnel to forward 3494 on A to 127.0.0.1:3493 on B. I then added 127.0.0.1:3494 using the UI, and it appeared. The entities are better named, "Foo Voltage", so it appears a bunch of rough edges are gone (which is typical in HA; just wait 6 months and things are smoother). I should delete and re-add my first UPS to get better names. I then graphed some of the things together and it all seems fine. So that's proof the integration can support two upsd servers, but you have to be able to contact them, and there is the convention that they listen on localhost only unless you change that.
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