Apex domains cannot have CNAME records.
Question and response
Question
dig rometex.org. NS
Answer
rometex.org. 5 NS ns-272.awsdns-34.com.
rometex.org. 5 NS ns-1231.awsdns-25.org.
rometex.org. 5 NS ns-1596.awsdns-07.co.uk.
rometex.org. 5 NS ns-1772.awsdns-29.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0