Apex domains cannot have CNAME records.
Question and response
Question
dig schplaf.org. NS
Answer
schplaf.org. 3 NS dns18.ovh.net.
schplaf.org. 3 NS ns18.ovh.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0