I think using /mnt/calibre is a very bad idea. That will (I believe) place files in the device's root file system; not in a location that you can access by any means other than koreader. It won't be visible when the device is attached via usb to your PC.
I'm not a koreader user so can't comment on what location you should use, apart from saying it should be in the /mnt/onboard directory tree.
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