Apex domains cannot have CNAME records.
Question and response
Question
dig redwormproducts.com. NS
Answer
redwormproducts.com. 5 NS ns72.cloudns.net.
redwormproducts.com. 5 NS pns71.cloudns.net.
redwormproducts.com. 5 NS ns74.cloudns.uk.
redwormproducts.com. 5 NS ns73.cloudns.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0