Apex domains cannot have CNAME records.
Question and response
Question
dig inceptolab.com. NS
Answer
inceptolab.com. 4 NS ns-1000.awsdns-61.net.
inceptolab.com. 4 NS ns-1047.awsdns-02.org.
inceptolab.com. 4 NS ns-1545.awsdns-01.co.uk.
inceptolab.com. 4 NS ns-209.awsdns-26.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0