If you're using a square tarp, you an also pitch it with the ridgeline offset from the centre then porch-mode the short side, so you're covered from vertical rain and slanty rain from one direction, but have clear air in the other.
One more option from the way back machine.
Call it the QB sneak
https://m.youtube.com/watch?v=xb90yZh16XI
Ambulo tua ambulo.
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