I don’t think there is any specific “right way” except that your gear is covered and you’re rigged so the water will flow off the tarp rather than pool in specific spot. In a real blowy storm, I’d baton down down the hatches. But I seldom plan a trip with that impending bad weather. Sure, the weatherperson doesn’t aways get it right, but it’s not like a sneaker storm will appear. So usually I leave one corner in porch mode for easy access an to provide a drain route for rain. I don’t think it matters which end is high if you decide to angle the tarp line - but I’d prefer the run off not be by my head.