We were able to view the fireworks from our room as well. I'm not sure what tower it was in, but, we faced the parking lot.
We had a pretty good view and we turned on the firework music (not sure what channel that was on, sorry) and while it didn't really go perfect with it - it still felt magical. They should, however, put the entire show music and voiceovers on the channel so it feels exactly as if we were in front of Cinderella Castle but as I said, the music didn't ruin the experience.
Have fun on your trip!