Re. outdoor storage.
When I lived in an apartment several years ago and had a Honda Silverwing 600 maxi-scooter that had to be stored outdoors, I bought a motorcycle cover for it made by Nelson-Rigg. They make several tiers of covers. The top tier ones are a rugged material with heat-resistant fabric where the mufflers would be, and weather proof vents near the top (the silver triangular panels shown below) so it could breathe and not retain moisture. It had a built-in bungee all around the bottom, as well as grommets for a bungee or something to cinch it up across the bottom to mostly keep the wind from getting under it.
It worked a treat. I think it was the Defender All Weather model from here:
https://www.nelsonrigg.com/motorcycle-covers/defender-all-weather-cover-detail
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Only thing to watch for is that rodents like to shack up in there for the winter. Many motorcyclists who have to store their bikes outside reported that having the bike covered by one of these makes them less attractive to thieves, as they can't immediately size up the value of what's underneath, not to mention the extra hassle of getting it off without drawing attention to oneself.
Imagine their disappointment if they were to pull it up and find that "only" an eBike lies underneath...