Apex domains cannot have CNAME records.
Question and response
Question
dig softronics.ch. NS
Answer
softronics.ch. 5 NS ns1.softronics.ch.
softronics.ch. 5 NS ns2.softronics.ch.
Authority
The response has no authority records.
Additional
ns1.softronics.ch. 5 A 195.201.16.178
ns2.softronics.ch. 5 A 91.214.170.39
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0