For 1D bodies, what about using the top left bracket and the bracket on the vertical grip as mounting points? Or would you still recommend using the plate attached to the bottom of the camera?
Our only hard-line recommendation is that you should only connect the Cinch to strap mount points that are, well, designed for straps. Don't go looping the webbing around the lens collar or the sharp elbow in an L-plate.
Beyond that, every photographer works with a different set of preferences, in different environments, with different gear. Our guidelines are really just a starting point; you should try attaching the Cinch in a couple of different ways and find out what works best for you, with your particular setup.
We made the Arca plate because we think *most* photographers, with the *most common* cameras will prefer bottom mounting. If you were to plot a bell curve of setup preferences, the base model Cinch is created to drive straight through the fat portion of preferences and make the most number of Cinch buyers happy, straight out of the box.
Get into the larger (1D, D4, Battery Grip) cameras, or more complex setups (L-Brackets, fitted Arca plates, flash brackets), and you'll be going out of the meat of the bell curve and into specialty territory. For those users, we have accessories like the Membrane Connector and PodMount to help adapt the system to niche needs. At the very least, the out-of-the-box Cinch will let you experiment with a naked camera and decide how you might best want to mount it, giving you more data points you might need to select the appropriate accessory.