Apex domains cannot have CNAME records.
Question and response
Question
dig 128-27.149.109.77.in-addr.arpa. NS
Answer
128-27.149.109.77.in-addr.arpa. 5 NS ns1.velden.media.
128-27.149.109.77.in-addr.arpa. 5 NS ns3.velden.media.
128-27.149.109.77.in-addr.arpa. 5 NS ns2.velden.media.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0