Apex domains cannot have CNAME records.
Question and response
Question
dig salesloft.com. NS
Answer
salesloft.com. 5 NS ns-1651.awsdns-14.co.uk.
salesloft.com. 5 NS ns-834.awsdns-40.net.
salesloft.com. 5 NS ns-482.awsdns-60.com.
salesloft.com. 5 NS ns-1248.awsdns-28.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0