Synsound wrote
From my understanding, you should only need one for each wall wart. It filters the supply from the source so whatever happens beyond that should be irrelevant.
It's true that noise on the supply rail often comes from the power supply itself, but it can also come from other circuits attached to the daisy chain. It's best that each circuit has its own low-pass filtering on the supply rail so that the signal from one circuit doesn't feed into the supply voltage on another circuit and cause oscillation.
It's not really possible for any of us to say whether a single filter on the daisy chain will be enough for anyone's particular pedal chain without knowing a lot of details about the specific builds of the circuits in question. The quickest solution is to try it on a breadboard and see if it works for you. Then be prepared to revisit your decision later when you play in different locations and at different volumes.
The huminator is a very simple approach that often works well, but it is often not a good enough solution for certain circuits that have voltage divider biasing into a gain stage, particularly when the circuit isn't amenable to low-noise biasing (eg. fuzz face, COT-50, etc.). For those cases, you really need either a regulated adapter or a battery.
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