Yes this is a 2-pack. Comes with screws too.
As others have stated, yes, they can be....but they cannot be used with self-grounding receptacles that rely on box contact for effectiveness. The grounding screw must always be used in such cases.
You have to have long wires. I was able to rotate the outlet 90 degrees perpendicular towards me, slip on the extender, and then rotate the outlet back vertally.
That is what they were designed for and is exactly what I did in my Livingroom.
Absolutely! The GFCI's have to fit a standard size box. At the opening of the insert, it is standard size, then tapers smaller to slip inside the existing box.
I don't see why not. The insert keeps the electrical away from the wood.
The maximum depth of this box extender is 1 1/2”. Sounds like you have an extra 1/4” to play with. Remember, the box extender fits inside your existing box.
Mine are 1.75" deep.
Yes it does.