Location of Mirage files in ember addon

I have an Ember addon which is supposed to handle a request to return some data. The main app needs to use this addon, so that requests to retrieve this data are retrieved from mirage. At some point in the future this needs to be disabled in live environments (but not for the time being)

My question is where the mirage directory (and its subdirectories such as factories, fixtures, models, routes etc) should be located in an addon. Should it be in the project root or elsewhere, such as in the app or addon subdirectory?