The Lenovo Mirage Solo had 6DOF tracking with the Daydream controller. It had an experimental 6DOF controller add on but Google killed Daydream before that shipped. Inside out PC headsets exist with the camera setup for 6DOF inside out.

Currently the Quest is the only Android based (and thus fully stand alone) headset that's wasn't Daydream branded and wasn't killed when Google mothballed their VR support. There's less now then there were, or would have been if Google stuck with it.

How about Pico’s line of devices?

https://www.pico-interactive.com/us/neo2.html