As everyone stated, right in front of attraction sign and the CMs will make anyone who is sitting on ledges around it Move about 5 minutes prior. It’s one of my faves, especially when Gamora Is with him, that’s best version.
We watched from the raised path across the street which gave us a good view and meant we didn't have hoards of people crammed around us. We were very lucky as the characters walked past us after the show so my daughter got a great photo with Gamora (her favourite).