Problem Child, frame sliders offer little to no rider protection, so they are not normally considered a safety feature for the rider or passenger. Sliders may in certain cases, offer some protection to parts of a motorcycle in the event of a minor tip over, or laying the bike down, but may actually cause more damage in a forward crash such as a low side or highside at speed. Different sliders attach at different places on different bikes. Some sliders for example attach to the engine and during certain types of crashes can cause engine case damage which is far more expensive than without the slider would have been caused to the fairings and other parts.
You may want to look into a set of rear highway bars to work in combination with your front bars to keep the shiny parts more protected during a parking lot/garage lay over or even during a minor parking lot/road crash. Most likely during a highway or crash at speed, there are going to be a lot more damage regardless of bars or sliders. I think a far better investment would be some training to help develop skills to assist in avoiding a crash along with how to get separation during a crash. Just some thoughts.