Apex domains cannot have CNAME records.
Question and response
Question
dig perimeterusa.com. NS
Answer
perimeterusa.com. 4 NS ns2.perimeterusa.com.
perimeterusa.com. 4 NS ns1.perimeterusa.com.
Authority
The response has no authority records.
Additional
ns1.perimeterusa.com. 4 A 165.212.182.10
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0