Hello, as publisher of the 1st edition I can say: 1 on each track and one on a port, that's it.
(p.s.: regarding the 2nd edition, someone from Cryptozoic must tell..)
Pg 4 Setup Step 9 reads
Beginning with the player to the right of the First Player and continuing
counterclockwise, each Tribe Leader sets one (1) Building Disk from the
General Supply (of his or her color) at any open Port Location of his or her choice, regardless of province color.