Apex domains cannot have CNAME records.
Question and response
Question
dig servihosting.com. NS
Answer
servihosting.com. 5 NS ns2.servihosting.com.
servihosting.com. 5 NS ns1.servihosting.com.
Authority
The response has no authority records.
Additional
ns1.servihosting.com. 5 A 84.232.1.100
ns2.servihosting.com. 5 A 84.232.1.101
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0