Accelerometers are dynamic measurement devices. The piezoelectric elements create a charge when deformed. However, that charge is quickly dissipated due to voltage leakage. For eample, they are good for cyclic vibrations that induce sinusoidal accelerations (a vibrating piece of machinery), but they do not work under a continuous acceleration (like gravity).
Honestly, I think that the accelerations are going to be so small that your measured signal is going to get lost in the usual noise of a system. However, it's easy enough to set up. Give it a go.