I am assuming but as far as I am aware that would be some separate app/service. You need a number that is locally registered so it routes to the correct dispatcher.
Can't iPads call 911 somehow? They don't have a cell modem. I've never really thought about it though...
I think any HomePod can call 911, so I assume this one will be able to as well, but yeah, it requires an iPhone within connection range. So not for kids left alone unless they have a phone.