I just got 2 wood duck houses to put around my pond. They did not come with any instructions. I am wondering; 1.) How far off the ground I should hang them? 2.) Which direction should the opening face, N,S,E, or W? 3.) Does it need to be directly above water? 4.) should I put wood shavings or straw on the bottom of them? If anyone has any experiance & advice in this matter, it would be greatly appreciated.