Thank you for your post maestro_user1234.
For setting up the 3 way switch from the Master and companion, we would recommend following this link here https://www.youtube.com/watch?v=QzhhM-3hCM4 to watch our YouTube video on wiring the companion dimmer.
Yes, I'm using a single pole switch to wire to the MACL-153M. And the 3-way functionality is retained.Quote