Tim Taylor wrote:
Is there a "set in stone" location for a starter pin in a router table base?

No, the ideal pin location is dependent on the size of the cutter and
the work. On shaper tables or manufactured router tables they take a
guess and generally put in two or three at roughly 2-3" distances from
the spindle at one or more locations. Generally, of course, you want
to feed into the cutter rotation and away from the initial end grain of
the work. Where the best feed point is is also dependent on the shape
being cut and the grain orientation.