Apex domains cannot have CNAME records.
Question and response
Question
dig webhost.co.nz. NS
Answer
webhost.co.nz. 1 NS aaden.ns.cloudflare.com.
webhost.co.nz. 1 NS penny.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0