Any omidirectional or semi omidirectional speakers are exactly what you require. I'm UK based and use a modified pair of NVA Cubix speakers and the ability to almost fine tune the bass by moving the speakers proximity to the wall has to be heard, it's really quite something. I know there are some very well regarded American designers of omidirectional speakers and I am sure you will be astonished by their performance viz a viz traditional design.
Ps Steve Guttenberg did a review a year or two which was very positive re one the American designs