hi, i just want to drop this here.
my magic mirror is running on a zero2 but very laggy, needs like 10 sec to activate the screen form the pir, often startup failures and so on.
i was about to move to a bigger raspi and tried to migrate my installation from the zero2 to a pi3.
unfortunatelly did not got MMM-Pir running.

so i switched over to MMM-Universal-Pir and everything is running so much smoother.
no need to replace the zero2 anymore :)