Apex domains cannot have CNAME records.
Question and response
Question
dig trustedshops.com. NS
Answer
trustedshops.com. 5 NS ns-955.awsdns-55.net.
trustedshops.com. 5 NS ns-1442.awsdns-52.org.
trustedshops.com. 5 NS ns-1784.awsdns-31.co.uk.
trustedshops.com. 5 NS ns-450.awsdns-56.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0