Apex domains cannot have CNAME records.
Question and response
Question
dig svpluss.lv. NS
Answer
svpluss.lv. 5 NS ns.svpluss.lv.
Authority
The response has no authority records.
Additional
ns.svpluss.lv. 5 A 185.69.24.248
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0