Apex domains cannot have CNAME records.
Question and response
Question
dig naamservert.nl. NS
Answer
naamservert.nl. 5 NS ns2.naamservert.nl.
naamservert.nl. 5 NS ns1.naamservert.nl.
Authority
The response has no authority records.
Additional
ns1.naamservert.nl. 5 A 185.117.226.60
ns2.naamservert.nl. 5 A 84.22.117.155
ns1.naamservert.nl. 5 AAAA 2a10:7180:100:0:0:0:0:60
ns2.naamservert.nl. 5 AAAA 2a02:2770:16:0:21a:4aff:fe7d:5713
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0