If I understand what you are describing, it sounds like you will be making square frames with half-laps on the ends. You can do this safely with the router table if you make a miter sled that either guides off the edge of your table or straddles a template guide bushing like Bob and Rick use. The sled ensures a consistent angle, and stop blocks will make sure the cuts stop in the right place. Use a bottom cleaning bit, as they are a bit wider, and you won't have to take so many nibbles. Make sure you have a sacrificial block of wood to prevent chip-out.
hope this helps,
hope this helps,