For hanging the parasol on the the door, I used a Command hook.
If you’ve never used them, I highly recommend them. (you’ll find a shopping link for them at the end of this post)
Here’s how they work… There are 3 components to the hooks…
The back part you put on the wall or door first, the actual hook front part, and the adhesive strip. That strip is what, when you’re done with the hook, just pulls down and stretches until it cleanly comes off the wall or door, just like magic. So you’ll need to replace the strip with a new one the next time you go to re-hang the hook again, but the other two plastic parts of the hook you re-use.