I don't think you are paranoid but you definitely asking for the impossible. You will have to put something on the wall...or the floor (but not the speakers though).
I am considering buying SC-HT05 home theater in a box system.The reviews on cnet seem to be great for this 600 watt system. I was also looking for other HTIB systems with tallboy design for the speakers. I was a little concerned the HT05 does not have tallboy design for the speakers. The speakers can only rest on the floors according to the description. I am not sure if the placement on the floor could affect the acoustics. If I do not want place on the floor what is the cheapest way to mount it on the wall without drilling holes? Or am I too paranoid about these minute details? Let me know