Apex domains cannot have CNAME records.
Question and response
Question
dig wheelchairaccessibleorlando.com. NS
Answer
wheelchairaccessibleorlando.com. 5 NS ns-1936.awsdns-50.co.uk.
wheelchairaccessibleorlando.com. 5 NS ns-536.awsdns-03.net.
wheelchairaccessibleorlando.com. 5 NS ns-1346.awsdns-40.org.
wheelchairaccessibleorlando.com. 5 NS ns-1370.awsdns-43.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0