Apex domains cannot have CNAME records.
Question and response
Question
dig enter.it. NS
Answer
enter.it. 5 NS dante.enter.it.
enter.it. 5 NS dexter.enter.it.
Authority
The response has no authority records.
Additional
dante.enter.it. 5 A 212.29.129.4
dexter.enter.it. 5 A 94.141.24.91
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0