Okay so a 'group' of one adult male, two/three females and their offspring for each species(say 7+) three outdoor enclosures between the two species.
I think even with rotation,the animals will continue to wreck the plantings in the indoor areas which they used more, and will continue doing so.. the less used outdoor areas are very well established already.
According to the plan which I posted earlier, there will be 6 outdoor enclosures (The two current ones, the two netted ones and two new non-netted ones). There will be 3 indoor areas adjoining the netted enclosures, so perhaps each species will get one each (therefore 3 outdoor exhibits each and 3 indoor each).