The apartment I just moved into has a hallway light with a switch at each end of the hallway.  Not sure what they were thinking when they wired it, but they used two 2-way SPST light switches in series.  The light is powered from switch 2.  Switch 2 has no power when switch 1 is off; if switch 1 is on then switch 2 can turn the light on and off.

What I'm going to do is use two TP-link TS15 smart switches to create virtual 3-way switching.  I will wire the input 115v to switch 1, and nothing on switch 1's output.  Switch 2 will always have power in parallel with switch 1's input, and be able to control the light.

In the Tapo app I will create an automation in which any switching of switch 1 will toggle switch 2.

My question is this: does the  TS15 physical switch have an ON position and a separate OFF position, or is it more like a button, where you push it the same for ON and for OFF?  

Thanks

Overly simplified, but basically this: