Should I also have a fuse between the transformer and TIU? What size fuse do you recommend? Between the TIU and terminal strip I am using 6x30mm 8 amp fast blow fuses.
One more time:
All that's required is a 10 amp, fast-blow fuse between the transformer Hot terminal and the red TIU channel input terminal.
Any different placement provides less benefit. Any additional fuses are redundant.