Apex domains cannot have CNAME records.
Question and response
Question
dig mx2.electric.net. NS
Answer
mx2.electric.net. 5 NS ns3.electric.net.
mx2.electric.net. 5 NS ns1.electric.net.
mx2.electric.net. 5 NS ns2.electric.net.
mx2.electric.net. 5 NS ns4.electric.net.
Authority
The response has no authority records.
Additional
ns1.electric.net. 5 A 208.70.135.83
ns2.electric.net. 5 A 192.162.219.248
ns3.electric.net. 5 A 208.70.135.236
ns4.electric.net. 5 A 192.162.219.153
ns1.electric.net. 5 AAAA 2a01:77c0:7135:4301:0:0:0:230
ns2.electric.net. 5 AAAA 2a01:77c0:1619:4100:0:0:0:230
ns3.electric.net. 5 AAAA 2a01:77c0:7135:4300:0:0:0:230
ns4.electric.net. 5 AAAA 2a01:77c0:1619:4101:0:0:0:230
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0