Unfortunately you cannot use two PR180-1LA's for what you want to do. :-( There is only one correct installation:
One PR180-1LA needs to be installed at the switch box which contains the cable that goes to the light (load). That is a must. One then installs a regular 3-way switch at the switch box which contains the cable with the hot from the breaker (line or source).
If you reverse the sensor location you will need 4 wires between the switches, which is not usual practice, as the bare grounding wire is not permitted to carry current per National Electric Code rules.
If you want a sensor at both locations you need to install a IPP15-1L at the switch box that has the cable going to the light (load). One must then install a IPP0R-1L at the switch box that has the cable with hot from the breaker (line or source).
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