Avantgarde Uno Nano suitable for small room?

Yes, the Unos's will work beautifully in that room. Close to the side walls,with appropriate toe-in and about 3' to the back of the speaker from the rear walls. Sitting position against the rear wall. Near field magic...especially with the Lamms.

Yes, as long as you are able to sit at least 10 feet away from the speaker to allow the drivers to properly integrate.

You will love the Lamms with Avantgardes. The room sounds tight but doable; the key as Brf noted is to sit 10+ feet away, but while also preserving width (tweeter to tweeter) of 83% of the distance from each tweeter to your respective ear, so to sit exactly 10 feet away the centers of the tweeters should be 8.3 feet apart. This will place the outside of the mid horns very close to side walls. Luckily the speakers are very directional so placement near side walls is of little concern. Good luck!

That's interesting. From the three responses above, it seems like the avantgarde have to be facing the short wall (with the sides of the speakers near the long wall.)

I currently have my speakers facing the long wall. I tried placing my speakers facing the short wall before and the sound stage was too narrow. I imagine that the UNO will be the same if I place them facing the short wall. Or is it different with horn speakers? If I place them facing the long wall then I will be 9ft away from the horns. Do you guys think this would work?

If I place the UNO facing the short wall then at least how far do I have to be away from the side wall?