Hi,
Your best bet is to store it and leave it. No reason to move it. Flatspotting isn't the issue it once was with steel belted tires. The Fabric (Kevlar and Aramid) belted tires don't have a permanent memory and the tires (if they flatspot at all) will round out as soon as the pressure is readjusted and brought up to temperature in spring.
There are also rubber mats which claim to prevent the flatspotting, but these are not really necessary. I store 4 cars annually, and never move them, never had an issue with the tires. So far as the TipS is concerned, it'll be OK just to leave it. For more info on Winter Storage see this thread:
http://www.986forum.com/forums/showthread.php?t=7567&highlight=Winter+Storage Hope this helps...
Happy Motoring!... Jim'99