I tried a couple more but was not successful with ds9.
The plugin was not visible but something remains…
indeed i needed to delete the corresponding files with os commands.
with the NG plugin it was running at least reliable.
I changed to Home Assistant. The Shelly plus PM2 are now integrated into Homekit.
You need to upgrade your firmware to the newest one. It will not work with eg. 0.14.1.
It needs a little bit more investigation but it runs now for a week without any problems.