Apex domains cannot have CNAME records.
Question and response
Question
dig alacompradetodo.com. NS
Answer
alacompradetodo.com. 4 NS ns1.alacompradetodo.com.
alacompradetodo.com. 4 NS ns2.alacompradetodo.com.
Authority
The response has no authority records.
Additional
ns1.alacompradetodo.com. 4 A 104.140.76.66
ns2.alacompradetodo.com. 4 A 50.2.99.88
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0