Question 1

Does it work for three way (or more) switch configurations?

Accepted Answer

It is designed for two separate single pole switches in a double-ganged, switch box like for two separate lights or a ceiling fan and it's light kit whereas three-way switches are double pole. However, you should be able to use the three-way wiring to provide:
1) always-on voltage to the Fibaro switch to power the two loads and 
2) always on voltage to the other switch box to power two separate z-wave remote controllers  that would then control the Fibaro double switch via z-wave. You could use a couple of these GE controllers in that other double switch box. 
https://www.amazon.com/GE-Bluetooth-Wireless-STANDALONE-12728/dp/B00PYMGYY0/ref=sr_1_5?s=hi&ie=UTF8&qid=1537355295&sr=1-5&keywords=ge+z-wave+plus+add-on

As an aside, I couldn't physically fit the Fibaro into my existing double switch box along with the 12-gauge wiring with all of the neutral wires. For the extra three-way switch wires in the configuration that I described you'd likely need a deeper box which is a definite pain in the neck. If you've got 14-gauge wires it might be made to fit. Regardless, if you elect to use two separate z-wave wall switches instead of the Fibaro double switch, internal box space can be a limiting factor. Also, the Fibaro apparently is not compatible with my Lowes Iris z-wave hub.

Question 2

Can I still turn "on" or "off" my lights if the switch is on "off" position?

Accepted Answer

if the installation is correct your old ( manual ) switch can be in whatever (off or on)  position and the Fibaro will act as a  independet switch.

Question 3

Does this have S2 security?

Accepted Answer

No

Question 4

can this be used in an rv, 12v to turn lights on and off?

Accepted Answer

No. You can use a dry contact switch to turn on/off if you have 120v available to power the dry contact switch.

ASIN	B01LZPD441
Best Sellers Rank	#1,408,767 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #2,859 in Electrical Light Switches
Brand Name	FIBARO
Color	doesn't work with HomeKit
Connectivity Protocol	Z-Wave
Connector Type	Screw
Contact Material	Nickel
Contact Type	Normally Open
Control Method	App
Controller Type	SmartThings, nexia, vera
Current Rating	15 A
Customer Reviews	3.9 3.9 out of 5 stars (48)
Global Trade Identification Number	00857934005263
Included Components	1 FIBARO Double Switch 2
Item Dimensions	1.67 x 1.5 x 0.8 inches
Item Type Name	Z-Wave Plus Smart Remote Relay for 2 devices
Item Weight	1.6 ounces
Manufacturer	Fibaro
Material Type	Plastic
Model	Double Switch
Mounting Type	Wall Mount
Number of Items	1
Operating Voltage	120 volts
Operation Mode	Toggle
Part Number	FGS-223
Specification Met	UL
Switch Type	Toggle
UPC	857934005263
Unit Count	1 Count
Warranty Description	24 months

FIBARO Double Switch 2, Z-Wave Smart Remote for 2 Devices, FGS-223, Doesn't Work with HomeKit

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