Apex domains cannot have CNAME records.
Question and response
Question
dig launchrock.com. NS
Answer
launchrock.com. 4 NS ns-730.awsdns-27.net.
launchrock.com. 4 NS ns-1821.awsdns-35.co.uk.
launchrock.com. 4 NS ns-411.awsdns-51.com.
launchrock.com. 4 NS ns-1075.awsdns-06.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0