With one mounted to make sure it had good contact, I continued to mount the rest. It's very simple. Just take the heatsink, set it on the chip carefully, and apply pressure for a few seconds. With all of them on, it looks good! They're a bit un-even, but you don't see them anyway.
I oriented them a certain way to the airflow from my side fan would pass through them, making sure they get the job done right.
While I was at it, I decided to sink my vDimm mosfet, too. You can view before & after pictures above. Anyway, on to testing!!