AVM fritz and ping check

I have several fritz-boxes in my home and they are auto-disovering devices.
now, I have some servers which I want to turn power off (relays connected) when they are shut down.
unfortunately, when I try to add an ping (ICMP) check, the integration tells me that the device is already configured (even if not in ping integration).
now, I tried to delete the device using developer tools → actions, but the only action for avm is wifi password reset.
now, I could create a ping entity by not using the name but the ip, but this is not so beautiful.
any suggestions would be great!