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... any position other than right-side up or on its side is fine, and that rule is only so it doesn't fill up with rain or snow, so if it's stored inside it matters not a bit. Aluminum won't "take a set", get bent or warped no matter how unevenly it's supported. Same goes for hanging it up, if that's your choice. However, if the end connections for rope attachments are little sheet-metal loops held on by tiny pins, you might avoid using them for hanging the boat, though I bet in most cases even that would be good enough.
Upside down over the wood pile.
(Oh, it should be an 'a'... apisdn)