Subwoofers with room correction built in?

One thing about auto EQ, unless a separate microphone is included with a long cable reach, Auto EQ will only use the subs built in microphone and EQ the bass for its resting location, not the listening position. Although, it will be better than not doing anything at all, in terms of bass EQ, you made still need to fiddle with the settings if the listening position does not sound right. That’s the thing about integrating subs into any listening  environment, you can adjust by ear, and/or adjust with measurement tools. 
More subs, as others have stated, and scientifically proven, will help to alleviate room anomalies by allowing a flattened low frequency response as long as the multiple subs are not exciting the same room mode, then you have to vary the positions of the subs within the room to help alleviate that issue. At the end of the day, auto EQ should help a lot compared to not doing anything at all, but with the caveats I stated above the measured frequency response at the listening position. 
What are your room measurements? I can send you a room mode calculation which will depict the room modes. It’s not a real live measured response but a scientific approach based on volume and size which normally is pretty accurate. Other factors could play into room modes, furniture, design, construction, etc, but, this approach gives one an “idea” of probable room modes before doing anything. 

Syzygy subs, we’ll built & have EQ, works extremely well. Out of business but still may be able to find. 

Martin-Logan X series can be used with a smartphone app that is OK. Much better results w Perfect Bass Kit.

The smartphone app is good for tweaking phase and level to fully integrate with mains.

In two years, the only negative is they are light and require mass atop them if they are on a compliant floor, i.e. media room above a triple garage with an unsupported ceiling. see http://www.ielogical.com/assets/Audio/SubWeight.jpg - somewhat low WAF factor

Yes, from what I understand the Martin Logan app is smart enough to "know" that not all phone mics are created equal so it first measures your phone mic then you can continue with the calibration. Pretty cool. But, yeah, the Perfect Bass Kit is better.

redwood, room control is really speaker control. You are adjusting the speaker to suit room acoustics AT THE LISTENING POSITION. Everywhere else in the room the correction will be wrong. You still have to do your best to improve room acoustics. The Room control in subwoofers is extremely basic. It can only adjust frequency and phase. It can not correct group delays and most subwoofers have low pass filters only and not two way crossovers. These are two serious flaws if you are looking for the ultimate bass. Having said this a sub with room control is better than without and using two of them will be an improvement in most systems
The absolute best way of going about this is to get a DSP preamp like the MiniDSP , Anthem STR or DEQX Premate. Then build a passive sub from a kit. PartsExpress has a lot of them. Then get a commercial sound reinforcement amp with a high damping factor >500 and a lot of watts.
I like QSC products over Crown. With a system like this you have digital control over everything including the crossover. If electronics are so susceptible to vibration why would you want to put them inside a subwoofer?