Apex domains cannot have CNAME records.
Question and response
Question
dig propersoconseil.com. NS
Answer
propersoconseil.com. 5 NS ns-1622.awsdns-10.co.uk.
propersoconseil.com. 5 NS ns-43.awsdns-05.com.
propersoconseil.com. 5 NS ns-211.awsdns-26.com.
propersoconseil.com. 5 NS ns-570.awsdns-07.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0