Though hardly an expert, I like the simplicity of running a line between two trees, then attaching the tarp to the line. Plenty of choices on how to connect the ends of the line to the trees, and it's easier to do when the tarp isn't attached yet. Connect the tarp above or below the line using prussiks/biners and adjust. Tie out guylines.
I just recently joined the Dutch family with the addition of two Tarp Flyz to my kit. I got them in anticipation of some camping I was hoping to do on the AT near Damascus, but it didn't materialize. But I digress.
I have not used them in the field, but I liked the idea of having the Flyz on both ends of my continuous ridge line made from Zing-It. It seemed to have the most flexibility depending on how far apart the trees are and doing the "V" Dejoha suggests working around the hammock suspension. I use klemheist knots on either end of the tarp at the ridge line so I can slide and center accordingly. I use the black drawcord that DIY Gear Supply sells for those. It really grabs well with just a few wraps. It is expensive at .21 per yard, but that's how I roll.
I keep the ridge line attached to the tarp and use homemade snake skins for storage. I can center the tarp before I even unroll it if I wish that way.