You can stick the case to anywhere you like.
Because the pads are made of film, they are thinner and durable than paper, so they wont be bulky even when applied a lot of time.
It is also semi-transparent so you can write on the top without covering the bottom letter.
The 0.2 inch (6 mm) width is very suitable for pointing to a line of books, so you can pinpoint the point of your mind when reading.