We chose the West side, but you can also do the respective spot on the East side.
Here's a view of the West side. I'm standing right at the FastPass+ entrance. The castle is to the left, Casey's is to the right with the red and white umbrellas. Main Street is straight ahead and beyond that is the East side and Tomorrowland Terrace.
There are 3 topiary in the middle of the FP+ viewing area. The spot I set up for fireworks (and Celebrate the Magic and MSEP... (I was really just too lazy and didn't want to move)) was behind the topiary closest to Main Street, against the back railing. I choose to stay as far back as possible as everyone else will cram to the front. That will create and empty space between you and the crowd, giving you the better view.
Here is the view from that spot. This was taken at 8:37 PM (April 21st). I got there around 8:20 and was one of the first ones let in. 16 mm on a full-frame.
MSEP from the same spot. You can only see the top of the floats from here. 120 mm.
Also from the same spot, Celebrate the Magic. 50mm lens on a full-frame camera.
Right before Wishes everyone is wonderfully considerate and moves toward the front to give you a better view. Notice, most people are in front of the topiary. The back half is nearly empty.
And of course, Wishes. This is not cropped, 16 mm. I wanted to get the topiary in the foreground, but a couple stepped right in front of it as Wishes started. (10 pm)
Those who want to use a tall tripod at this exact spot should have no issues of blocking anyone's view. There is a tall topiary directly behind this spot.