An LLC is a pass-through entity, which means you don't pay corporate tax but you pay personal tax on all profits. With an LLC, you can't pay yourself with dividends like a normal company, so it won't count as "foreign sourced income". This means that it's generally a bad solution for paying less tax, as personal tax rates are much higher than corporate.
You should look for countries with low corporate tax that don't tax on dividends.
You should look for countries with low corporate tax that don't tax on dividends.