Logically I think some page turn controls should be underneath a reader. They always put them on top so you can see them but once one knows where they are does one always look to find them? Those buttons are the ones used the most.
The reason for my wishing them underneath is that one has 4 fingers resting there, as for the top you only have the thumb. When one uses a button placed on top, depending on reader position, as soon as the thumbs is moved gripping is compromised with danger of dropping. Now if a button underneath is used, one finger can be moved without interfering with the holding grip as the 3 others continue. This bottom button could be software locked on demand. This way reading can be a one handed affair in any position as long as the device is not too heavy.
Navigating buttons have to remain on top for clarity.
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