"default" place to put triangle of art ???

[ZebedZebub]

is there a specific cardinal point where the triangle of art should be put if one cannot know the cardinal point a spirit is ruling?

[Gandridur]

You have to remember that four elements have nothing to do with the physical north, south, east and west. And there are no rule set in stone. Trust your instinct and put it where it feels right for you.