Apex domains cannot have CNAME records.
Question and response
Question
dig pltpro.com. NS
Answer
pltpro.com. 5 NS dns3.pltpro.com.
pltpro.com. 5 NS ns4.pltpro.com.
pltpro.com. 5 NS dns4.pltpro.com.
pltpro.com. 5 NS ns3.pltpro.com.
pltpro.com. 5 NS ns5.pltpro.com.
Authority
The response has no authority records.
Additional
ns3.pltpro.com. 5 A 143.192.105.2
ns4.pltpro.com. 5 A 103.21.254.126
ns5.pltpro.com. 5 A 143.192.101.55
ns3.pltpro.com. 5 AAAA 2404:6300:0:0:0:0:1:2
ns4.pltpro.com. 5 AAAA 2404:6300:0:0:0:0:2:2
ns5.pltpro.com. 5 AAAA 2406:e300:1:0:0:0:200:2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0