Apex domains cannot have CNAME records.
Question and response
Question
dig v3.wpxhosting.com. NS
Answer
v3.wpxhosting.com. 5 NS fm1.wpxhosting.com.
v3.wpxhosting.com. 5 NS fm2.wpxhosting.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0