The fact that a speaker is rear ported is immaterial. Most of the energy is coming out the front of the speaker. A port acts as a camber to lower the resonant frequency and increase the efficiency of the design.
In my 20 years of professional experience it depends on the room as well as the speaker how the sound will interact.
Also with many rear ported speakers you can try an old trick of stuffing things in the port to change the loading. Many companies include pre made bass plugs for this very purpose.
We used to use tubes from paper towels in a pinch which sometimes tightened the bass and dissappated bass bloat.
Really matching a speakers bass output with room size is much more relevant. If a speaker goes too low for a room to contain the bass the speaker can produce you are in for standing room city, which is worse than a little extra bass bloat by putting a rear ported speaker in a cabinet!