Yes. If you buy a protections stone 11x11x11 then you have 5 blocks in each point protected area.
It is 5 up-down,front-back, right-left. The 6th block is not protected.
The visualization provides you a "visible" room that you can build in and to be protected.
When you place it, then it is activated. But, if you want to act with the commands, then you pres /ps and the rest that you will see on the list.