Even more important for a long time storing as upright or horizontal seems to me to unlock the shutter. As Mamiya recommend uncocked storing of lenses, this might be an issue for Hasselblad too (but I guess it by knowing Mamiya's recommendation and don't know it in detail for Hasselblad)..
Hasselblad's recomendation is that the shutter remain cocked.
Hasselblads were designed to be stored cocked. Furthermore, a cocked lens can be safely put on or taken off a cocked body. If either a lens or body is not cocked, attaching or detatching will damage both on the first attempt.
Warning!! Handling a Hasselblad can be harmful to your financial well being!
Nothing beats a great piece of glass!
I leave the digital work for the urologists and proctologists.