Yes easily.
It plugs into the wall, not the garage door opener at all. It actually stays on all the time.
This does not connect to the garage door opener, it is a simple red dot that is on all the time and plugs into a 110v outlet.
Easiest way might be one of the screw in adapters for a light socket.
Yes, it is just a red dot. If not on the motor, you could also use the front of the boat, it is a mater of positioning.
It will only work on one car. There is only one beam.
As close as you want to but you will still need to have room to open your doors. You can locate the laser point wherever you want it.
It emits a laser beam you can see to give you alignment with the front of your hood. For two cars you would need two.
The length of the cord for the Laser Park Assist is 4ft.
Yes, this includes the wire which is approximately 8 ft long.