I have one of those green metal posts with some holes and hooks on it like you showed on tv. What do you use to fasten a bluebird house on it? My e-mail is Thank you.
I placed the back of the bluebird house against the “flat” side of the post and used screws through a couple of the holes in the metal post. Just make sure the screws are long enough to get a good bite into the wood but not so long they come out inside the box.