I am interested in installing two laser lights that would attach to the ceiling of our garage. They would be alligned so that the light would show up on the dash of our vehicles to indicate we are at a preferred spot to park in the garage. I have done a bit of research and there are numerous kinds with power ranging from double a batteries to 9 volt batteries to plug in to 110. Activation is by the light turning on from your opener or motion sensor. I am wondering if anyone has any experience with these units and could give me some pros and cons of different devices or any recommendations. Any input is appreciated. Thanks