This nest should be able to put both inside and outside the cage. Excluding, for outdoor installation, cut the protruding part of the cover of the set, so that it sticks to the cage and also it can be opened to monitor the brood and also cleaning. Personally, I added 2 hooks for hanging on the wall of the cage. This kind of product designers do not think at all unfortunately. Otherwise I do not regret my purchase (I bought 2).