Q1: Solo Mining vs Pool Mining
However it seems that with pool mining, you'll earn something roughly like .11 LTC/month/Apollo right?
That will vary and it can vary a lot. Most likely the LTC difficulty will still keep slowly increasing so the LTC/month/Apollo will decrease and eventually it comes to the value of LTC itself. The history graph below shows the 24 hour reward for the last 3 months from litecoinpool with a single Apollo running 24/7. As you can see, the LTC/day is decreasing but USD/day far more unpredictable.

Q3: Moon Landers
?
That said, are they worth picking up and plugging into the Apollo?
From efficiency point of view, it's not worth it. The Apollo can be tuned to run around 1.1 W / MH/s where as the Moonlander 2s I had were somewhere around 2.5 W / MH/s. On the other hand, there's the learning aspect of getting the Moonlander running in the Apollo which may be worth something.