Good article, and plenty thorough enough. I have an easy and very effective system for hanging baffles. First, get two nails at least 2 inches in length, and bend these to form a right angle. Place the nails on opposite sides of the mounting pole at the height you want the baffle to hang, about a foot below the box. Attach the nails to the post with a hose clamp, which then creates a sturdy but wobbly hangar for the baffle. Then, place the baffle over the top of the nails, and the wobbling motion will deter just about any critter. And if you size the hole in the baffle just right to fit over the pole, even snakes will not be able to climb the pole. I have used a variety of baffles, including stove pipe and even an old satellite dish with a hole drilled in the middle, and this system has yet to see a critter get past it. Just make sure the baffle is large and high enough so nothing can jump around it.
And as mentioned in the article, cats can be a problem, so I would be remiss if I did not strongly encourage cats to be left inside. I had a cat trained to walk on leash, and it worked out well for both of us. Check out http://www.abcbirds.org/ for more information on bird conservation, including keeping cats and birds in harmony.