Apex domains cannot have CNAME records.
Question and response
Question
dig geurzak.com. NS
Answer
geurzak.com. 4 NS ns-303.awsdns-37.com.
geurzak.com. 4 NS ns-104.awsdns-13.com.
geurzak.com. 4 NS ns-84.awsdns-10.com.
geurzak.com. 4 NS ns-1590.awsdns-06.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0