Review on Maximizing Drawer Space: Industrial-Grade Drawer Slide Extension Hardware by James Roper

When the rail is attached to a gliding object, there is no access to the screw holes between the center and the rear. At the front of the slide you have 3-4 entrances and at the back you only have the last rear opening. As a workaround, I think I can deploy to get access, but that's for the manufacturer to decide. If you're installing a heavy object, you'll need extra support along the entire length, not just the front.