a fully extended chassis on rails in a wall mount anything (frame or enclosure) is going to place an extreme amount of pull force on the wall attachment points.

I would personally not place anything but a static, fixed load into a wall mount.

equipment on rails is a lifesaver and, if you really want to do it, consider a freestanding enclosure thats designed to take deep servers, extended loads and has anti-tip features.

just my 0.02

Hopefully the rack is mounted directly into the studs or concrete. I’ve seen them crush gypsum between the stud and paint too…

I’m not much help, but they all suck. I’ve bought probably 2k worth of universal sliding rails to attempt with various servers. I don’t know why but none of them fit properly. None of them slide properly. They are all just annoying. I gave up with them. I bought the OE sliding rail kits for my various servers and magically everything works perfectly.

For servers where I want to move them in and out but don’t want sliding rails, I just buy those universal L bracket type mounts. The servers slide well enough on them, they’re just powder coated bent steel. And a single screw from the front panel into the rack keeps it secure enough since the weight is being held by the support, not its own ears.