Do you have to have a hard case to use this or can you still mount the tablet without a case?

We only have a smart cover for our ipad & the pic/description for this headrest mount talks about using with a hard case- wondering if you have to have a hard case or if it's just saying that you don't have to remove your hard case if you have one on...

Felix RoadShow Car Stand for iPad

Felix RoadShow Car Stand for iPad

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