Yep, D8 is not the best choice for a Active Low Logic relay board.
For my Washer and Dryer, I am using an Aeon Labs 1st Gen Power Meter with a custom Device Handler. I was able to buy a few of these for <$15 each during a sale a few months back.
And here is the custom Device Handler which sends “button pushed” events to CoRE to send my wife and me text messages each time either the washer or dryer is complete. It works very well. I tried using a SmartThings Multisensor’s accelerometer, but it wasn’t reliable. The power meter has been working great for me.