Total newbie here. Info on NestWatch indicates the side of a structure is a suitable location for a nest box. Have had kestrel in the area, but not as frequently in recent years. I'm in a rural area of central Maryland. We have an ESE facing side of an old barn that has open fields around it. I am wanting to install a nest box there. First, is that reasonable? Second, I think recommended height above ground is 10-30 ft. If I put the nest box on the outside, I can get it up at least 15 ft with a ladder. My new thought is to make an entrance hole in the barn siding and then actually mount the nest box on the inside side of the barn side, lining up the entrance hole of the nest box with the entrance hole through the siding. That would make the wood thickness at the entrance hole about 2 inches, hope that is not an issue. If I do it this way, I can monitor very easily because I can go up into the hay loft and the nest box would be at approximately chest or head level so easy to reach without needing a ladder. I have a method that I think will work to line up the entrance holes.