Apex domains cannot have CNAME records.
Question and response
Question
dig romandie.hosting. NS
Answer
romandie.hosting. 5 NS ns2.geneva.hosting.
romandie.hosting. 5 NS ns1.geneva.hosting.
Authority
The response has no authority records.
Additional
ns1.geneva.hosting. 5 A 185.56.25.43
ns2.geneva.hosting. 5 A 185.249.241.26
ns1.geneva.hosting. 5 AAAA 2a02:4fe0:0:4:0:0:0:b
ns2.geneva.hosting. 5 AAAA 2a0b:4780:0:3:0:0:0:b
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0