Apex domains cannot have CNAME records.
Question and response
Question
dig gerardino.net.do. NS
Answer
gerardino.net.do. 2 NS ns2.siteground.net.
gerardino.net.do. 2 NS ns1.siteground.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0