Good point & good remedy.
I could be completely wrong, its happened before, but I think those silver tarps would be maybe twice as much but would deflect much more heat.
Using wood as anchors would sturdy it up nicely.
I'm going to be building multiple wind-blocks this year by getting a 8' length of 4x4 or 6x6 studs, screwing a thick eyelet in the tippy top, building a base for it so that the beam sits at a 60 degree angle or so, using the eyelet for guylines & also to attach 1 corner of a large tarp to....the opposite corner of the tarp will be stretched out & rebarred down to the ground & the other two corners of the tarp will be folded down & rebarred as well to create a triangular shaped (almost taco shell shaped) wind block.
Not really worried about it working as a wind block as much but more just as a visual add on.
we'll see how it goes!