Placed wherever there's space for groups to gather around Paradise Bay (vending carts may need to move). On the bay side of the railings, stored lower than the railings by day, then lifted into place at showtime. Camera(s) where possible (the new light towers?) act as a live feed for the monitors. Visitors can watch the 'front view' onscreen, while seeing the effects in the bay. That new park area where the Rustworthy(?) was is also a possibility.
Screen size and show height would depend on the area for each screen's group.
It should help, and if the pictures are visible (LED), you could eventually use the screens during the day, showing ride wait times, character appearance and show schedules, cartoons, etc. (I'd limit or avoid ads...)
This idea freely given...