Apex domains cannot have CNAME records.
Question and response
Question
dig hrs-it.com. NS
Answer
hrs-it.com. 4 NS ns2e.itocservices.net.
hrs-it.com. 4 NS ns2s.itocservices.net.
hrs-it.com. 4 NS ns1e.itocservices.net.
hrs-it.com. 4 NS ns1s.itocservices.net.
Authority
The response has no authority records.
Additional
ns1e.itocservices.net. 4 A 138.69.12.71
ns1s.itocservices.net. 4 A 138.69.4.69
ns2e.itocservices.net. 4 A 138.69.12.72
ns2s.itocservices.net. 4 A 138.69.4.70
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0