Apex domains cannot have CNAME records.
Question and response
Question
dig grfstudio.com. NS
Answer
grfstudio.com. 4 NS ns2.register.it.
grfstudio.com. 4 NS ns1.register.it.
Authority
The response has no authority records.
Additional
ns1.register.it. 4 A 81.88.61.2
ns2.register.it. 4 A 195.7.227.1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0