How do I put the dock on the top (external) monitor in a dual monitor setup?
Someone showed me one solution: there's a sort of "shelf" created where the bottom monitor is narrower than the top. If you move your mouse on the top monitor until it hits that shelf, the dock will pop up to the top monitor. However, if you move your mouse to the bottom of the bottom screen the dock will move back there. 

This should be sufficient for my problem, but I'm leaving this up in case other people have alternative answers (and if this will be helpful for someone else).