Reinhard,
In anticipation of replacing my 2017 iMac with a new MacBook Pro in the spring, I recently added a 2023 Mac mini M2 Pro with 32 GB RAM and 2T SSD.
I got this combination as a headless server that runs WeatherCat, Roon Core (music server), Plex Media Server, and Security Spy (security camera hub.) The only other applications running on that machine are Backblaze (for backups), Amphetamine, and MacUpdater.
It is currently running MacOS Sonoma and WeatherCat 3.2 Build 364. All I needed to add was Xcode, and I'm still running V14.3.1 of that. I'm not running the latest development version of WeatherCat, as it does not yet have the modules included for AWEKAS, PWS, or WeatherCloud.