The BetWasp surebets and value bet search service offers an interesting option of filtering results by country. With its help, you can remove/add surebets with events from certain countries to appear in the results. You can find out these settings in Multifilter - Countries section.
You will be able to open the full list of countries using the "show/hide" buttons located next to the "Select all" checkbox.
Initially, all countries are selected in the settings, but you can adjust the selection for your specific needs. After checking off all needed countries, save the filter. On the screen above, you can see only 2 countries selected (Chile and Egypt): with these settings, only surebets with championship matches from the indicated countries will be shown in the search results.