Apex domains cannot have CNAME records.
Question and response
Question
dig layerdns.cloud. NS
Answer
layerdns.cloud. 5 NS ns-49.awsdns-06.com.
layerdns.cloud. 5 NS ns-1773.awsdns-29.co.uk.
layerdns.cloud. 5 NS ns-1160.awsdns-17.org.
layerdns.cloud. 5 NS ns-611.awsdns-12.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0