Hydra Grid sounds like exactly what I've been looking for since grouping my displays. Is this included in CCC?
Yep. There are actually some very cool desktop management features of CCC, including Hydra Grid and multi-desktop. In the older CCC (that installs with the Catalyst 10.12a hotfix), you can find the Hydra Grid options tabs on the upper right side of the window, IIRC. You enable it, apply it, and you can build exactly the grid you want. I just built a grid that has 4 vertical dividers - one at each bezel so I can eliminate the space between bezels. Just putting two lines in made the edges of all of my windows reside in the bezel space.