Just create a vehicle set like you normally would:
struct VehicleInfo VehicleSet[]=
{
{ 32,126, mapLynx, mapMicrowave, North},
{ 34,126, mapLynx, mapMicrowave, North},
{ 32,124, mapLynx, mapMicrowave, North},
{ 34,124, mapLynx, mapMicrowave, North}
};
Then insert them into the base set:
struct BaseInfo Base1= { 0,0, 0,0, 0,0, autosize(VehicleSet) };
Now, as you can see, i left the spots for buildings, walls and tubes empty (all 0's), and when used with CreateBase(0,31,-1,base1); it creates the units where you want them.