Feature Requests invert geoip filter test

I have a service that should be reachable by some of your monitoring locations, but not by others.
An invert test would be nice. S.t. I could have the same location, but assert that it is reachable by
e.g. Germany and Canada, but NOT by e.g. Singapore

This way, if somehow my geoip filter fails and thus the site is reachable from your Singapore monitoring location,
I would be made aware ...