Apex domains cannot have CNAME records.
Question and response
Question
dig feinrohren.it. NS
Answer
feinrohren.it. 5 NS ns3.contonuvolastore.impresasemplice.it.
feinrohren.it. 5 NS ns4.contonuvolastore.impresasemplice.it.
feinrohren.it. 5 NS ns20.contonuvolastore.impresasemplice.it.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0