Apex domains cannot have CNAME records.
Question and response
Question
dig inwx.ch. NS
Answer
inwx.ch. 5 NS dell.ns.cloudflare.com.
inwx.ch. 5 NS damon.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0