I’m about to push the button to get 2 SVS 3000 micros to add to ATC SCM40s.

Thanks for reminding me about the break-in period. In my excitement over new gear, i forget several important things, such as this and turning off my Loki.

Unfortunately, there is absolutely nowhere for the subs to be besides where they are--peeking out from behind the mains. If I were single... maybe, maybe not. It's a weird, open space.

@m669326 I usually adjust one sub at a time. And yes, be patient with break in  

How big is your room?

I would say that if you also want optimal performance, good quality power cables and subwoofer interconnects can make a profound difference in the speed and definition of the bass. 

I would mostly  call it  a large room with a vaulted ceiling, but one of the speakers has a short throw to the glass wall while the other goes out into a lot more space. There’s seven corners in the main part

with a hallway going off one end  and a  stairway going off beside one of the speakers. It is.  an open floor plan to a kitchen that has two doors to other rooms that are open. There’s a variety of furniture and stuff to break up waves. Only two short walls even  have space for pictures on the walls or speakers since all the other parts of the room are floor to ceiling glass. All in all, I consider it to be a difficult room, but there are no right angles or places for waves to bounce and each other head on, so I suppose that’s good. 

I’d be interested in anyone’s point of view.  about my room from an acoustic or a subwoofer angle.

OK, try facing the subs toward a wall with about a 3 to 4 inch gap. There are room treatment panels that are portable as well. I use one in an open doorway in the back of the room and move it out of the doorway when not listening. 

The other thing to try is the DSPeaker 8033II sub equalizer which would help dial it in. Give the subs time to break in before changing anything though.

https://auralex.com/shop/portable/

Since these are side firing subs, aiming one side at the wall would mean the other would be firing toward the listening position. Is that what you mean?