How are they going to stream to these- is it for using one or two zones at a time?

I think it's time to ask more questions.

The best BT receiver I have found is from Miccus- the sound was better than I had expected and the range was amazing. It can be used as a transmitter or receiver and they state that if a pair is used, the range is around 300'. If it performs as a pair as well as the single ones have, that should be accurate- I was over 150' away with my iPhone when I tested the first one I installed and it never dropped out. Miccus have analog and optical IN/OUT, too.