Apex domains cannot have CNAME records.
Question and response
Question
dig wlxh.nl. NS
Answer
wlxh.nl. 5 NS ns2.wlxh.nl.
wlxh.nl. 5 NS ns1.wlxh.nl.
Authority
The response has no authority records.
Additional
ns1.wlxh.nl. 5 A 84.244.138.11
ns2.wlxh.nl. 5 A 217.148.161.138
ns1.wlxh.nl. 5 AAAA 2001:15c8:11:2:0:0:0:11
ns2.wlxh.nl. 5 AAAA 2001:15c8:11:3:0:0:0:138
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0