Does anyone known of a source for open back, low voltage, old work, electrical boxes that are intended to be installed through the Sheetrock and mount to studs?
I've found boxes for old construction like this that mount on the Sheetrock and for new construction like this and this that mount to the studs.
What I have is an existing building where I need to install Ethernet cable inside the walls without ripping out all the Sheetrock. I'm not to thrilled with the Sheetrock mounted boxes and know that with some effort a box can be mounted on the studs (I've seen it done).
This type is a little deeper than the example that you gave and might accommodate having a couple of holes drilled in one side and then driving screws through them into a stud.