Apex domains cannot have CNAME records.
Question and response
Question
dig mt.lv. NS
Answer
mt.lv. 5 NS ns2.mt.lv.
mt.lv. 5 NS ns1.mt.lv.
Authority
The response has no authority records.
Additional
ns1.mt.lv. 5 A 159.148.147.248
ns2.mt.lv. 5 A 159.148.172.248
ns1.mt.lv. 5 AAAA 2a02:610:7501:3000:0:0:0:248
ns2.mt.lv. 5 AAAA 2a02:610:7501:4000:0:0:0:248
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0