I had not heard of “Linked Places” before. Even a quick Google search pulled up a bunch of irrelevant information, but sifting through the noise it seems like SmartThings ‘Linked Places’ are kind of like ‘places’ (zones) in Life360.
I don’t personally use Life360, but I believe a number of community members use it and enjoy it. Since Life360 can be connected to SmartThings, I wonder if Life360 circles could be used as triggers for you?
Edit: it looks like there’s a community developed Life360 integration that is popular, but from a quick review, I don’t think it exposes multiple places – I think you have to select a single place to trigger present / not present events. Maybe someone else who uses it can speak to how it works and if you can create multiple instances for multiple ‘places’.
Also to clarify, everything I found seemed to indicate ‘Linked Places’ are only precise to a general geolocation similar to Life360… not down to an individual room.