I have a game warden friend who catches poachers with his cameras. He'll set up one in plain view, then two more watching the trail at 8 to 10 feet above the ground in separate trees. The astonished look on the poachers face is hilarious! They'll lie with supreme confidence, knowing they deleted the evidence, then he'll show them the other pictures. It's priceless!
Good friend of mine does the same. I look up when I'm walking so I saw it about 12-13 feet up, angled down a trail. I waved and then texted him. He said he catches numerous trespassers with it and the photo evidence is incredibly helpful.