Apex domains cannot have CNAME records.
Question and response
Question
dig enflow.nl. NS
Answer
enflow.nl. 5 NS nscloud1.enflow.nl.
enflow.nl. 5 NS ns1.enflow.nl.
enflow.nl. 5 NS ns2.enflow.nl.
enflow.nl. 5 NS nscloud2.enflow.nl.
Authority
The response has no authority records.
Additional
ns1.enflow.nl. 5 A 185.233.173.153
ns2.enflow.nl. 5 A 185.233.173.150
nscloud1.enflow.nl. 5 A 192.174.68.100
nscloud2.enflow.nl. 5 A 176.97.158.100
ns1.enflow.nl. 5 AAAA 2a0c:eb00:0:f10:185:233:173:153
ns2.enflow.nl. 5 AAAA 2a0c:eb00:0:f10:185:233:173:150
nscloud1.enflow.nl. 5 AAAA 2001:67c:1bc:0:0:0:0:100
nscloud2.enflow.nl. 5 AAAA 2001:67c:10b8:0:0:0:0:100
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0