Apex domains cannot have CNAME records.
Question and response
Question
dig halloma.com. NS
Answer
halloma.com. 5 NS dns2.halloma.com.
halloma.com. 5 NS dns1.halloma.com.
Authority
The response has no authority records.
Additional
dns1.halloma.com. 5 A 46.21.128.101
dns2.halloma.com. 5 A 46.21.128.102
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0