I need some big help. I need to find site with BetBuilder Player Props powered by Prop Kingz. This is the builder used in BetOnline,Sportsbetting, MyBookie, Bovada and e.t.c.
As you mentioned, I think Bovada, Sportsbetting, BetOnline, are comprehensive for the betting options you mean to players, besides the props they provide there are even more interesting ones to enjoy such as head-to-head, team and individual options, if players make Props.
Indeed, BetOnline, Bovada, Sportsbetting sites do not accommodate customers from Bulgaria or what, so you want to look for other gambling sites that use game props and are supported by the Prop.
However, I tried to find a gambling site that has Prop support especially for Bulgaria, but it's a little difficult to find it, but I found a gambling site
(DraftKings Sportsbook), which has options as you mean, take a look here: https://www.legalsportsreport.com/daily-fantasy-sports-blocked-allowed-states/, is there any support for customers in (Bulgaria), try to check.