Both of those require creating at each different location...
But oh well, I figured it out. Now I'm only using 7 switches... lol
Here's how:
If there is no p1, p1 switch is automatically cleared.
If p1 loses or leaves, p1 switch is cleared.
Create 21 units at spawn.
Distribute 3 to each place.
If p1 switch is cleared, remove all units at p1 spawn.
Still kinda complicated, though. The reason I don't like creating 3 at each location seperately is every new level, you have to change the unit being created 7 times, and when you have a lot of levels, that gets annoying. With my way, you just change it once every level.
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You can have a location move onto a stationary unit which is in the area where the enemies spawn, so you don't have to recreate the trigger 7 times per unit.