Apex domains cannot have CNAME records.
Question and response
Question
dig erectaat.com. NS
Answer
erectaat.com. 5 NS ns2.erectacloud.it.
erectaat.com. 5 NS ns1.erectacloud.it.
Authority
The response has no authority records.
Additional
ns1.erectacloud.it. 5 A 62.149.165.66
ns2.erectacloud.it. 5 A 77.241.10.110
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0