Apex domains cannot have CNAME records.
Question and response
Question
dig ads-electronique.com. NS
Answer
ads-electronique.com. 5 NS ns2.ads-electronique.com.
ads-electronique.com. 5 NS ns1.ads-electronique.com.
Authority
The response has no authority records.
Additional
ns1.ads-electronique.com. 5 A 81.28.99.7
ns2.ads-electronique.com. 5 A 81.28.99.11
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0