MK Arrival time to get spot for CtM & Wishes

[Mom2J&J]

We'll be coming in the evening on 6/2 to roam around Main Street and stake out a spot for Celebrate the Magic and Wishes. How early do you think we should get to MK to get a good place at Casey's Corner or near Crystal Palace....or would you recommend another place altogether? I'll have two littles with me, so I'm a tad worried about the "tall person in front of us" factor if we stand on Main Street.

MSEP is at 9:00, Wishes at 10:00.

Thanks for any advice.