The ******* in me will tell you get a garage. The reality is I'm with you on this, because I like many am too poor for a garage haha!
So, my suggestion to you is this: Make your own grommets. I'm pretty sure they sell the metal eyelets so you don't tear your fabric. If you cannot find them, try getting some large washers, drill holes through them so you can bold them together on each side of the fabric, then you can hook your bungee cord or whatever you use to hold the cover on.
You can try hot gluing them together, but I'm not sure they'll hold on the fabric in high winds and your cover may tear. Be creative, there's a million ways to skin a cat.
So, my suggestion to you is this: Make your own grommets. I'm pretty sure they sell the metal eyelets so you don't tear your fabric. If you cannot find them, try getting some large washers, drill holes through them so you can bold them together on each side of the fabric, then you can hook your bungee cord or whatever you use to hold the cover on.
You can try hot gluing them together, but I'm not sure they'll hold on the fabric in high winds and your cover may tear. Be creative, there's a million ways to skin a cat.