Apex domains cannot have CNAME records.
Question and response
Question
dig alchemer.eu. NS
Answer
alchemer.eu. 5 NS ns-1912.awsdns-47.co.uk.
alchemer.eu. 5 NS ns-440.awsdns-55.com.
alchemer.eu. 5 NS ns-898.awsdns-48.net.
alchemer.eu. 5 NS ns-1127.awsdns-12.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0