I think you will have timing issues. While Roon does a pretty good job synchronizing multiple zones, you'd need synchronization within a few milliseconds to keep phase errors from causing frequency response problems. Synchronization accuracy is not that tight, even if you were using the same model streamer and dac.
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miniDSP SHD's out put Dirac 3 to 2 seperate zones. Run Roon from a Studio to seperate DAC's just like that.
I power mine with an UltraCap 12 for a small improvement.