As Kswim mentioned, the upside-down orientation is ideal for long-term storage (unless the hull is supported underneath the chines via hull cradles or bunk racks while being stored cockpit-up), and the rolling storage cart option is certainly worth considering if you have the floor space and/or may want to just roll them outside the garage whenever you need extra workspace, etc.
Before moving to my current home (where I use modified hoisters with bunk racks) I had built a makeshift storage cart for my Hobie Islands and their accessories. Essentially they were made out of some old oversized moving dollies, scrap deck lumber, and two HFT 'portable work stands' serving as the risers/crossbars. Initially I stored both upside-down, with the AI underneath and the TI up top, but later added some PVC bunk rails to both levels so it was easier to work on them and store their accessories with them as well.
I did a quick search to see what sort of simple /sturdy horizontal wall mount options were on the market these days (thinking it may be easiest to modify a lumber storage rack), and came across this set that definitely looks promising:
StoreYourBoard 4 Kayak Storage Rack, Wall Mounted Indoor Garage Organizer, Holds up to 400 lbs.
https://www.amazon.com/dp/B07V4G9NST/ref=cm_sw_em_r_mt_dp_4XYB8NBW8B099Z54GW58?_encoding=UTF8&psc=1You could always add some extra padding (foam pipe insulation or otherwise) too, but as always, the easier it is to access/ re-stow your gear, the more often you'll be able to enjoy it!