Apex domains cannot have CNAME records.
Question and response
Question
dig xn--kisnavn-p1a.fo. NS
Answer
xn--kisnavn-p1a.fo. 5 NS ns2.xn--kisnavn-p1a.fo.
xn--kisnavn-p1a.fo. 5 NS ns4.xn--kisnavn-p1a.fo.
xn--kisnavn-p1a.fo. 5 NS ns1.xn--kisnavn-p1a.fo.
xn--kisnavn-p1a.fo. 5 NS ns3.xn--kisnavn-p1a.fo.
Authority
The response has no authority records.
Additional
ns1.xn--kisnavn-p1a.fo. 5 A 193.227.117.226
ns2.xn--kisnavn-p1a.fo. 5 A 194.50.187.226
ns3.xn--kisnavn-p1a.fo. 5 A 194.0.182.226
ns4.xn--kisnavn-p1a.fo. 5 A 194.0.182.226
ns1.xn--kisnavn-p1a.fo. 5 AAAA 2a04:2b00:14cc:0:0:0:0:226
ns2.xn--kisnavn-p1a.fo. 5 AAAA 2a04:2b00:14dd:0:0:0:0:226
ns3.xn--kisnavn-p1a.fo. 5 AAAA 2a04:2b00:14ee:0:0:0:0:226
ns4.xn--kisnavn-p1a.fo. 5 AAAA 2a04:2b00:14ee:0:0:0:0:226
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0