Nevermind, I realized that MCC edit was my issue. If I hold alt while selecting all the units, I can disable simulation in the checkbox with all of them. Sharing my solution in case anyone tries something similar.
I'm trying to see if there's a way to edit multiple units at once. I have the toggle simulation module thanks to ACE3, but I'm trying to figure out how to use this module on more than one unit at a time. I'm trying to put together an effect where all AI units stop in place as though their frozen in time, but this is the only roadblock for me. Any advice would be greatly appreciated!