Hi, so we have 20 acres out in the foothills, miles of open land, mostly cattle fields. We renovated an outbuilding and evicted two barn owls, booo. Last week while walking the dog, four barn owls flew out of two different bushes, we have no trees, non for miles. I want to build a shelter for them and am wondering if I can make multiple boxes on one pole, like do they mind neighbours, or if not, how far away should each house be?