Because of the tougher glass or plastic on the top, it would take a pretty hard impact to break the substrate underneath. The more likely way to break the substrate is to bend or twist the case. So, don't hold your reader by one corner and wave it around. Don't put it on a soft surface and apply pressure to one of the edges or corners. Don't sit on it, or roll over on it in bed. If it has a touchscreen, don't press on it hard enough to bend the glass.
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