Apex domains cannot have CNAME records.
Question and response
Question
dig squalo.tech. NS
Answer
squalo.tech. 3 NS ns2.itars.eu.
squalo.tech. 3 NS ns1.itars.eu.
Authority
The response has no authority records.
Additional
ns1.itars.eu. 2 A 5.157.72.1
ns2.itars.eu. 2 A 91.185.193.219
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0