I’ve done this by making every passcode a phone number for someone important. Mom’s phone number unlocks the computer, Dad’s phone number unlocks the tablet.
Where are these datacenters? I live in Ohio in the area of two of the points on the home page at https://sia.tech/ One appears to be a private residence or a farm. The other dot is literally on a golf course fairway, is a private residence, or a power substation.