The seamstress has finsied sewing the seams for my 12 x 12 tarp. I had her sew 10" triangles in the corners on both sides of the tarp and 6" x 6" squares in the middle of each edge, again on both sides. So I feel certain that there will be enough material to support either grommets or sewen in loops. I'm leaning toward putting in grommets - only beacuse it is easier and cheaper. any suggestions?