Not really. There's nothing to attach them to.
The rain would have to be really blowing for that to be required.
No
maybey command strip it up there or double sidded tape
You can use plastic. However, as Candi said you would not need the sheets as the shelters are quite large.
The shelters here are fairly large. I have been here in a heavy downpour and most of the area remained dry.
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