Crude visual of possible angles towards the castle and fireworks launch site. Exact angles and height will be critical in terms of actual views, there's a lot going on with possible obstructions with shoreline trees, to what extent CR/BLT are in the way or not, etc. I suspect that section around the boat dock and leisure pool (which has fewer shoreline trees) will be pretty decent, especially higher floors.
No idea where the source of this info came from, but I'm reminded of this
2018 WDWNT article which referenced a "2-Level Fireworks Viewing Lounge" and has some oddly specific narrative related to the overall resort. "Remember that lobby hallway from earlier? It leads into this fireworks viewing lounge, with small islands of moss and large dandelion light fixtures illuminating the space."
For the sake of speculation let's say that is accurate - marrying it up with
@bioreconstruct aerials on X and a
recent article from WDWMagic with photos from this past week, the section with the red circle would be in the zone of having a good MK angle, would be "off the lobby hallway" on the third floor, and appears to have a two-story component to it as it doesn't match the room/balcony layout above it and does not appear to be rooms.
All speculation of course!