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I would put it as near to the edge of the roof bars as possible so that when it is open you don't have to lean too far over to reach -you will need to stand on something anyway ( unless you are a giant). The same goes for a thinner one.
There are usually holes on the box for mounting the brackets - if not drill your own. As long as the front end of the box doesn't overhang the bars by too much it should be ok, place it more or less centrally front to back, perhaps with a bit more overhanging the front end.
Currently in SportTourer's garage:
2010 Laguna III SportTourer Initiale Tom Tom.