Is it common to install shut off valves in a residential plumbing setup between pex tubing without a support of some sort, or is it a better practice to try to install the valves onto a joist?
I'm planning to use the standard pex clamp supports for the tubing, but am trying to decide how I lay it out, and if the valves should land on a joist (Either on the bottom or side) to support the valve, or if that isn't necessary.

