Apex domains cannot have CNAME records.
Question and response
Question
dig chinacity-tampa.com. NS
Answer
chinacity-tampa.com. 5 NS ns-400.awsdns-50.com.
chinacity-tampa.com. 5 NS ns-583.awsdns-08.net.
chinacity-tampa.com. 5 NS ns-20.awsdns-02.com.
chinacity-tampa.com. 5 NS ns-431.awsdns-53.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0