The change in the “tripped” variable is the event causing the notification. So it seems like your sensor works. Mounting the sensor upside down is hard to do. I am not sure it would be the behavior expected if it was the case. When the value is 1, your sensor should be non vertical. When the value is 0 your sensor should be head up vertical.
And yes, all battery operated sensors need to be woken up for them to be polled or configured from the vera. When they get tripped or untripped they do send a zwave signal. some wake up to do it, some don’t.