Did you look at the above Smarthome URL? It's a wall mount switch. All Z-wave saves you in this case is having to run an extra wire between switches to make it 3-way.
It would be VERY helpful if you would supply a list of requirements and constraints for your project. I didn't see any mention of power limitations any of your previous postings. Note that if your load has PF correction and the inrush current is under 15A, then you can consider the load resistive.
However, if power, reactive loads, or position of the moon are potential problems, I suggest isolating the device with a relay, also known in electro-jargon as a contactor.
There are also alternatives. You can achieve something similar to a 3 way switch using a latching contactor. A latching contactor has two coils and the usual armature controlled contacts. The armature is latched into either position with some mechanical derrangement, or with magnets. Apply power to one coil, and it goes one way. Apply power to the other coil, and it goes the other way.
Controlling a latching relay lighting system is done with momentary push buttons, not conventional light switches. Each station will have two push buttons (on and off). What's nice is setup is that you can have more than 2 stations to control the lights. As a bonus, the latching contactor does not suck power when energized, thus doing your part to save electricity.
Here's typical data sheet for a 3 pole 30A magnetic latching contactor:
A friend (RIP) wired his entire house with such a setup. 4 position wall plates, fitted with 8 momentary push buttons, and located in the usual light switch positions. Some were wired, while others were wireless. Most of the loads were run by latching contactors in the basement. No problems with the county code cops. I may have photos (somewhere) if you're interested.