Apex domains cannot have CNAME records.
Question and response
Question
dig hostrd.com. NS
Answer
hostrd.com. 5 NS dns1.hostrd.com.
hostrd.com. 5 NS dns2.hostrd.com.
Authority
The response has no authority records.
Additional
dns1.hostrd.com. 5 A 135.181.237.61
dns2.hostrd.com. 5 A 95.217.34.54
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0