The real least intrusive option would be to just ask people to quarantine and trust that they do it as their civic duty. You could also offer a small support check at the end if they completed the quarantine without being seen out of the house or offer payment if they download the app and allow location permission. There are so many ways to run a quarantine program without resorting to locking people away or making them use the equivalent of a house arrest bracelet. It's concerning that you don't even see how totalitarian this is. These people weren't convicted of any crime, they caught a highly contagious virus that we will never eradicate and will be living with for the rest of our lives.