I don’t think there is a maximum amount of feeder wires. The minimum recommended is one feeder pair per block with a block being 10 to 12 track sections as I recall. If you have long track sections such as 37” flex track, you need fewer feeders than if you use sectional 10” track sections.
I would start with at least one feeder per loop and see how it works. Your 180 watt power supply should be enough for two locos. Use 18 gauge or larger wire.
