Apex domains cannot have CNAME records.
Question and response
Question
dig miami-servers.com. NS
Answer
miami-servers.com. 5 NS paislee.ns.cloudflare.com.
miami-servers.com. 5 NS oswald.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0