Multishop/multilanguage with different TLD: best practice

[ItalianBoutiqueShoes]

I have a multilanguage e-commerce with different domains name: .fr, .it, .de, etc.

Wich is the best practice to set the site with this configuration: one shop group for each language or one group with an URL for each language?

With the first option I am not able to set the language for each url.
With the second option the language module don't work.

Which is your suggestion on it? Do you use a specific module for redirect the customer to his own language/currency? Usually it is correctly done with multilanguage site, but not through multishop. Thanks