Recessed Lighting?

My suggestion would be 4. 30 inches out off of 20' wall x 24 inches out off of 10' wall. That would give you the light off the fan kit to illuminate the middle of the room making the recessed lights mainly decorative but also functional to light up the corners. I would also recommend a standard can that you can purchase at any home improvement store. 6" is industry standard with a 65 R 30 lamp. I have been an electrician for 23 years. Good Luck!