For the ridge lines and corners, I use the aircore pro cord and tensioners. I tie off with clove hitches.
Typically I have three or four short (fifteen inches or so) of aircore 2 with an overhand loop on each end). I use these as needed for side pullouts. They aren’t permanently attached to the tarp and I girth-hitch them when I think they will help. Usually I wrap the cord around a goodsized rock rather than actually stake them out, since the side pullouts need less tension than the corners or ridgeline — and I can still adjust them from under the tarp by simply moving the rock. The other thing I might do with those cord is use them as extenders for the corner tie-outs if the placement is awkward, where I tie them to the main cord with a double sheet bend and stake through the overhand loop.
I also usually carry and extra six or eight feet of aircore pro (or gossamer gear’s very similar EZC line) that I can use to extend the a tarp ridgeline around a really big tree.