Apex domains cannot have CNAME records.
Question and response
Question
dig showerink.shop. NS
Answer
showerink.shop. 5 NS ns-28.awsdns-03.com.
showerink.shop. 5 NS ns-1594.awsdns-07.co.uk.
showerink.shop. 5 NS ns-578.awsdns-08.net.
showerink.shop. 5 NS ns-1634.awsdns-12.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0