Yes, but those DACs will not share a clock and will therefore have some amount of drift between them. For zone linking, I am not sure if this will be audible. I have been told that the drift is significant when you want to use multiple sound cards to do things like electronic crossover, where the inter-sound card timing becomes important because small changes in timing equal changes in the phase relationships.
I'm just not sure how much the drift actually becomes over time. If it stays under 30mS or so, you should not be able to hear the timing difference.
Also, you can NOT make or break links using JRemote. You can do that from MC's computer interface, or with a third party remote called EOS. EOS runs on Android only.
Brian.