The maximum number of LEDs with serial shift control on one output is 64, for which you can use four DM13A drivers with daisy chain connectors.
I have 2x 4 DM13A drivers on my overhead panel running on pin#41 and #42.
I'm not sure if there are any limitations on pin#30-#37. I don't think so.
I also had problems in the beginning that some DM13A drivers were not recognized. It was 99% always a bad or incorrect wiring. But with about 128 connections only for the corrys, this can happen ;-).