Just a quick thought, but would it be preferable to attach something like this to the PCB using connections for current measurement rather than the ACS chip?

Modules have the benefit of being optional, so you can skip them if you don't want them on a certain channel. In other words, it is conceivable to have 4 out of 5 channels that report and 1 that doesn't, for example.

Because the cost of the module and chip are same, I don't believe there is any difference from a financial standpoint.

-AM