So that I understand it correctly.

16-bit is 65535, so what is 16384?Maybe I misunderstood something?

It's a signed 16-bit number with a signal range of 16384 in the positive and -16384 in the negative for the +- 2G range.

 

It's a signed 16-bit number with a signal range of 16384 in the positive and -16384 in the negative for the +- 2G range.

That makes sense.

So that means each bit represents about 0.120 cm?

Would there be any advantage to using multiple device, in comparison to just one?

 

That makes sense.

So that means each bit represents about 0.120 cm?

Would there be any advantage to using multiple device, in comparison to just one?

In theory, an array can provide better S/N ratios with deconvolution but these type MEMS sensors are just too noisy for micro-tremor detection in any practical application.
https://en.wikipedia.org/wiki/Microtremor
https://en.wikipedia.org/wiki/Deconvolution
https://www.analog.com/media/en/technical-documentation/dsp-book/dsp_book_ch6.pdf

Resolution just tells us how many close together things are present. Those close together things could be noise. Even with high resolution we still need accuracy and precision from the sensor to the end detector to make the system a useful detector of X.