1N of the copper is maximum overlap! 6 tiles with MM and 2 tiles with AO. I understand we consider vertical growth to be the winning strategy in thin maintenance-heavy game. And we are on a beeline to Hereditary Rule via an almost guaranteed early religion. So we definitely have not a tight happy cap! Why would we then hamper both MM and Copper City's future growth by having them share 6 tiles? Vertical growth also means grabbing as much land with the least amount of cities.
I also think we want to settle where the pigs end up in the inner ring. That leaves these spots.
In my opinion that leaves two spots. On the copper and 1E of the copper. Now, I fully agree we have to have more scouting info from the SE. Also keep in mind that this is the area/direction we have an agreement on with CFC. Planting the copper city might be the last city we can plant in this direction, assuming that the "border" is pretty close by.
Planting on the copper gives short term production benefit and saves around 6 worker turns for mining and roading and needs only one road (city to river) to connect up copper. And copper cannot be pillaged this way. It also has a river side grass land W-SW of the copper. For long term production that city would have at least 4 hills. Also the tile SE-E of the warrior seems to be a grassland tile.
This would be my suggested Copper City (given the current map knowledge!)
Settling E of the copper gives the least amount of overlap, loses any good river side tiles for Copper City.
Another nice little benefit of the settling on the copper or 1E of it (IIRC), is that the 2nd ring tiles that it shares with MM and AO instantly fall within our borders (= free partial border pop).
In any case I feel horses are more important to grab (especially seeing that copper is pretty much secure (close by and CFC border agreement).
But roading the grassland cottage at AO is probably a wise choice.
mh