Apex domains cannot have CNAME records.
Question and response
Question
dig shoptet.net. NS
Answer
shoptet.net. 5 NS ns1.myshoptet.com.
shoptet.net. 5 NS ns2.myshoptet.com.
Authority
The response has no authority records.
Additional
ns1.myshoptet.com. 5 A 185.184.254.88
ns2.myshoptet.com. 5 A 5.9.132.222
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0