I have unusial case. In my old garage I have two mechanical 3 way switches (S1 and S2) on each side of garage. What is unusial, each side has identical wiring: Black phase wire connected as traveler, White neutral wire connected as another traveler and Red Load wire connected as Common wire on each switch. 

It looks like it powers on light when one of 3way switches connects Red Load to White Neutrlal wire and another connects Red Load to Black phase wire on switch side, which means that Red wire from each switch connects to the light bulb.

Now I have a concern:
1. Will HS210 work with my existing wiring?
2. In case if connection is possible, can I use only one HS210 switch or I should use a Kit with 2 switches for proper operation?

Appreciate your help.