What CPUs are you using?

Yes they’re tool less

I’ve seen some bad rails and some very good ones. The SuperMicro 4U sliding rails are built like a tank. In the past I’ve stacked 3 loaded 4U chassis on top of a server with SuperMicro rails and it held it like a champ. Don’t worry, I installed rails in them eventually. Having them stacked made it impossible to service any of them but the top one. The Silverstone rails I have are “OK” but not great. I would trust them not to just break but I’m not going to be server stacking.