Apex domains cannot have CNAME records.
Question and response
Question
dig hostinger.COM. NS
Answer
hostinger.com. 4 NS dns1.hostinger.COM.
hostinger.com. 4 NS dns2.hostinger.COM.
Authority
The response has no authority records.
Additional
dns1.hostinger.COM. 4 A 198.41.223.130
dns2.hostinger.COM. 4 A 162.159.10.188
dns1.hostinger.COM. 4 AAAA 2400:cb00:2049:1:0:0:0:c629
dns2.hostinger.COM. 4 AAAA 2400:cb00:2049:1:0:0:a29f:abc
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0