Single accelerometers are usually less useful, but they do have some important purposes like registering shakes, steps, angle of inclination, falling down and so on when it is integrated with a BLE beacon as one kind of motion sensors, and then it will be a very good solution of detecting the object/person’s movement trace when it tilts any.

For acceleration, in real use-cases, with the aim of more accurate detection, you usually may care about the big changes and want to avoid noise, like the gravity, thus a high-pass filter can help isolate the linear acceleration and a low-pass filter can help isolate the gravity. A low-pass filter can thus be useful for measuring a tilt, thus, usually a 3-axis acceleration sensor is preferred to be integrated with a BLE beacon , rather than 6-axis acceleration.

When a 3-axis acceleration sensor is integrated with a BLE beacon, the 3-axis (X/Y/Z) variable values will be broadcast by a special packet and your software thus can translate the angle of inclination.
Notice, as an accelerometer reports acceleration values, you need to get velocity by integration:
v = ∫a×∂t
And again to get position:
x = ∫v×∂t
An integral creates drift, and a double integral amplifies that:
a = g×sin(θ), x = ½×at2