Apex domains cannot have CNAME records.
Question and response
Question
dig host-vision.com. NS
Answer
host-vision.com. 1 NS dns2.host-vision.com.
host-vision.com. 1 NS dns3.host-vision.com.
host-vision.com. 1 NS dns4.host-vision.com.
host-vision.com. 1 NS dns1.host-vision.com.
Authority
The response has no authority records.
Additional
dns1.host-vision.com. 1 A 46.4.107.20
dns2.host-vision.com. 1 A 176.126.200.40
dns3.host-vision.com. 1 A 94.130.189.177
dns4.host-vision.com. 1 A 51.195.150.221
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0