I dont think you're able to get more than 5 teams.
Maybe Poland, The Netherlands, USA, (Finland) and Belgium play.
I don't think you'll get more teams.
Or you should allow more teams per country.
Though I dont think you'll get more than 8 teams anyways then.

I do not vote because you can always TRY it.
If you put enough effort in it, it can work.
Also, the people who participate should be active enough (as in being online) and willing to play.