Oh my god a few searches later I now have found the root cause.
Because I haven’t found out how or what triggers the Location Semantic cards I tried a lot of stuff and made some wrong conclusions.
So equipment can stay as a group and you only have to apply the proper Semantic Class & Semantic Property.
In my humble opinion should be mentioned in the semantic model tutorial.
[Semantic Model | openHAB](https://OpenHAB | Semantic Model)
Solution from @Erik_Bergstrom - Thanks a lot for pointing that out.
And the link to the design spec from @ysc:
