I would like to place a $1,000,000 bet on an upcoming football (soccer) match. The match is in Sweden (Superettan) tomorrow and the odds I am looking to bet are 1.88. So I will win $880,000.
You can try with Sportsbet.io if you have account there and if that match is available.I have seen them accepting very big single bets and people are posting that on social media.
There is always possibility for some betting limitation on lower leagues.
Likely nowhere if stake won't take your business.
Nowhere because you are now advertising stake in your signature? 