This recent thread discusses locations to watch HEA from outside the park:
Where to watch MK fireworks outside of the park
But no location other than The Hub/Main Street inside the park will give you an adequate view of the projections.
As an example, from a TPV room at CR, you can kind of make out that ‘something’ is happening on the castle, but it’s not clear and has no entertainment value from that distance.
On the plus side, I’m of the opinion that HEA is a really good fireworks show on its own, so I don’t find the lack of visible projections a big negative for out-of-park viewing, especially for repeat viewers who have already seen the show from the Hub.