Apex domains cannot have CNAME records.
Question and response
Question
dig avalon.hr. NS
Answer
avalon.hr. 5 NS dns2.avalon.hr.
avalon.hr. 5 NS dns1.avalon.hr.
Authority
The response has no authority records.
Additional
dns1.avalon.hr. 5 A 188.165.33.31
dns2.avalon.hr. 5 A 185.58.73.221
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0