Apex domains cannot have CNAME records.
Question and response
Question
dig vps75437.inmotionhosting.com. NS
Answer
vps75437.inmotionhosting.com. 2 NS ns1.inmotionhosting.com.
vps75437.inmotionhosting.com. 2 NS ns2.inmotionhosting.com.
Authority
The response has no authority records.
Additional
ns2.inmotionhosting.com. 2 A 70.39.150.2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0