Only for one night, less worries
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Don't get stuck, check the surface. Park with your front to the road, keeping your front wheels on better surface.
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More or less level
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Don't block anybody
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Avoid to park to close to rivers (flash flood)
Recommendation: find 2 or 3 spots during day-light, mark it in your GPS, eat somewhere else, return at fall.
Multiple nights = worth taking your time
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Surface
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Orientation & trees for shade (or sun)
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Surroundings (ditch can smell or more insects)
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Orientation of other campers on neighboring plots
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Route to services (toilet, showers, beach)
Apps
Bubble level or Waterpas
Compass