I would say display all units (every unit type that has movement left) as an experimental beginning. I would also say overlap if needed. Display like a big harmonica, with few units having the luxury of standing side by side, but many units are forced to be stacked like a deck of cards. Maybe later, if there is a need to show less, display the five to ten most numerous units, with the most dangerous/most valuable/units be placed to the left and having lesser units possibly overlap.
Would it be possible to have units disappear from the territory scroller display and disappear "live" as they are moved? That would be a good feature indicating how done the current selected territory is.
Also, if the last "unit left to move" is moved, could it be possible to "grey out" all the buttons, indicating that the player is all done moving.
If there is a need, the info text "units left to move" could perhaps stay right above the top of two rows of buttons, between the unit pictures and buttons. Perhaps it could stay as a relatively discrete text also function as the only "space" between units pictures and buttons. Same goes for unplaced units collapsed bar (with "None" text removed to free more space) , but I think we should really test it out before we can judge it.