Apex domains cannot have CNAME records.
Question and response
Question
dig maderavintners.com. NS
Answer
maderavintners.com. 5 NS ns44.domaincontrol.com.
maderavintners.com. 5 NS ns43.domaincontrol.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0