As proposed and discussed in #4412, the pillar could receive a minimum distance between each other,
because these structures are outstanding and they have not been built right beside each other, more like one per city.
The minimum distance also gives the player a bit feedback when they are useful and when not (the auras don't stack)
In this first revision of the proposal, the mauryan trading speed bonus monument receives the minimum distance equal to the radius of the range,
so that the territory of a city can still be fully covered.
The iberian attack bonus monument receives a minimum distance (150) grater than the diameter (100) of the monument, so that
it can only be used in certain strategic locations rather than covering the entire territory, as proposed by mimo in the ticket.