If you get 2 small Maroons there's a chance they will pair up. Maroons are the most difficult Clownfish to pair in my experience.
Your tank is large enough to support 2 or 3 pairs of Clownfish IMO but I would expect the Maroon to immediately evict the Ocellaris out of the best Anemone once the Maroons mature. If the Anemone are close together I would expect the Maroons to claim both of them.