Did you even know your Model Y (5 seat) had an extra storage area in the trunk? I know, crazy. The floor cover is not easy to lift though, and that's where our 'no drill' handles come into play.
Sometimes, simple is best, so this simple, but sturdy, strap runs under the lid, attaching with Velcro, leaving a handle sticking out at each end, and allowing you to easily access more precious storage. Maybe you'd put our sunshadein there?
To install, simply lift the trunk floor panel, and attached the strap to the underside using the Velcro, leaving the handles sticking out at each end.