Don’t worry too much about resolution with 2 channel data rates. They are pretty low, around 48 kHz. Yes, running from your TV’s digital outs to your moon is the simplest best sounding method for your current set up.
When you are ready to step up consider an Anthem MRX 540. You can use it for all your HDMI needs, power center and surround speakers, and send your L and R to your Moon.