Is your goal to have independent volume control for both sets of speakers running at the same time? If so, your answer is likely no. At least I didn’t see anything about Zone B operation in the c2700 manual. I did own a McIntosh mx-120 that did allow for independent control in 2 zones.
If you only need to control volume for either set of speakers at a time (same listening session), then I don’t see why setting up the ATCs as output 1 or 2 wouldn’t work.
You may want to look into something like the McIntosh CR10 for total control. I have no idea if the CR10 wouldn’t impact the audio quality of your system.