I made a 4mm 10'x10' that I kept continuously hanging in my backyard for over 3 months straight. I only 'retired' it when I had another DIY project that needed the hanging space. Except for the plastic getting hazy, and a few places where the tape had just barely started delaminating from the plastic it was in great condition. I didn't do any edge protection at all.
I made two different styles of tie-outs using duct tape or Gorilla tape. Both held fine.
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The 4mm plastic was obviously much heavier than your 2mm, and now I'm thinking of making one in 2mm like yours.
They are great to sit under on a pretty day. Not fun to sleep under on a bright moonlit night . They do make 2mm plastic sheeting in black if that is a concern for anyone.
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