This placement guide is intended for useful suggestions to give authors ideas on ways to implement the rating system in a way that is visible to readers but also maintains design integrity or in a way that suits the author's desired result.
The content warning page (if included) is an excellent location for displaying the rating label, especially for eBooks, and since it would be listed alongside the specific warnings or QR code that will take them to the full list of warnings. This location is more concealed and not immediately visible from the shelf display, but is still easily findable before the story starts.
However, any location that you fits your desired design is always acceptable, using either the transparent or white background label.
The copyright page is a more concealed way of implementing the rating label and is especially useful for eBooks. This is the least invasive implementation of the rating label in a way that is still visible to readers while maintaining design integrity.
However, any location that you fits your desired design is always acceptable, using either the transparent or white background label.
OTHER INTERNAL PLACEMENT SUGGESTIONS:
Publisher imprint on the title page
Dedicated rating page within the book
The back cover is a good location to display the book rating. Near the barcode is a commonly viewed space (while still remaining innocuous) where the rating can be seen without much incumbrance on the cover design element of the book.
However, any location that you fits your desired design is always acceptable, using either the transparent or white background label.
The spine is another good location (top or bottom) to display the rating. There is typically real estate available on the spine, allowing the rating to be comfortably displayed without sacrificing the larger cover elements and while still remaining inconspicuous, but easily visible if needed.
However, any location that you fits your desired design is always acceptable, using either the transparent or white background label.
The front cover is an acceptable location for easily displaying the logo to ensure readers see it. This location is the most invasive regarding the artwork, however, the transparent version of the logo can be implemented here while still remaining design integrity.
However, any location that you fits your desired design is always acceptable, using either the transparent or white background label.