Well, that's a reasonable idea with two issues:
- I (and others) have tried using that sensor to monitor washer/dryer starting/stopping, and they are mediocre at best.
- Aqara sensors are not very stable on Hubitat, unless very specific Aqara-compatible zigbee routers are used.
Of those two, the first is trickier to overcome. Some people try to increase motion/vibration by tethering a vibration sensor using a spring, but even that is hit & miss as exemplified by @codahq's example here.
Although to be fair, others have found that tethering via a spring is sufficient for it work perfectly.
