I think “edge” here refers to the release version, right? There is nothing like a “core” version like for Windows servers or something like that?
Why not have two docker containers on a pi, each running z2m?
Excellent; good to hear. Yeah, I like the UZG-01.
Re multi-instance Z2M: I haven’t done it yet myself (I’m still running ZHA + Z2M), but I’ve seen quite a bit of discussion on the forum here that looks like multi-instance Z2M is quite possible by adding multiple instances of the Z2M HA add-on. The important thing seems to be configuring different TCP ports for the instances on server side, and different MQTT topics for the two (or more) Z2M gateways.
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Reference to the “edge” version is usually when you want to run multiple instances on the same host as HAOS. The addon store includes the standard and edge addons, so it is pretty easy to run two z2m instances under HAOS using both addons side by side. It is a common suggestion. If you wanted everything under HAOS it would be worth considering. There are simple hacks to run two copies of the release addon side by side under HAOS as well.
But…
In your case where you are docker-savvy and comfortable with running on a separate Pi, then two docker instances each running the standard z2m release would be the proper solution.