Hi there,
A member of our alliance suggested the idea of Trio-stations (a station where all 3 services can be based/dispatched from). I know it is rather niche however there's already the ambulance expansion to fire stations, and a number of local authorities have begun moving towards these hubs for all 3- (or in some cases 4-) services being based out of a unified station.
The inclusion of this in came would help increase the realism and reduce the need for placing the 3 separate stations in the same place.