Apex domains cannot have CNAME records.
Question and response
Question
dig holhost.com. NS
Answer
holhost.com. 1 NS ns2.cloud-f51007.managed-vps.net.
holhost.com. 1 NS ns1.cloud-f51007.managed-vps.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0