Apex domains cannot have CNAME records.
Question and response
Question
dig mgr-consult.com. NS
Answer
mgr-consult.com. 5 NS ns1.mgr-consult.com.
mgr-consult.com. 5 NS ns2.mgr-consult.com.
Authority
The response has no authority records.
Additional
ns1.mgr-consult.com. 5 A 95.141.43.71
ns2.mgr-consult.com. 5 A 95.141.43.73
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0