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