How can you know that speakers can correctly pressurize his listening area\room – is there a role of thumb for room vs. speaker cabinet size\drivers number\drivers size\driver technology?
There really is no easy answer. Size is not what matters it's frequency extension, spl capability, room interaction/room modes and room size. As an example I have a full range system in one room where I can get good placement for imaging and even bass response. In my living room can't do that and have a subwoofer added into the mix to extend and smooth things out even though it's an open floor set-up so larger space.
The speakers have to have the LF extension and SPL capability to begin with so I would use that as a reference. Placement is going to be determined obviously by the layout of the system furniture and so on.
You could have the most capable subwoofer on the planet and room placement can turn it into a one note wonder.