I've been looking at Apollo for a while now but haven't purchased it yet. How are you liking it?
The bitcoin.org website has a guide on how to open up port 8333 and forward it to your node (your Apollo in this case).
Look at the Network Configuration section of this page.
https://bitcoin.org/en/full-node#network-configuration
Let me know how it goes! I'm curious about Apollo. Which pool are you thinking of using?