Hi Jon, thanks for your question. Technically the 5DB will fit onto the i29 stand, however we really recommend a higher position for them to get the best effect. The standard recommendation is to mount them to the walls about 5-7 ft. up from the floor if you can; however there are some stands out there that should work. Wood Technology makes a 42" high stand that would get the speaker to the proper height:
The top plate is 4.5" square so it may be a little smaller than ideal so I'd recommend using something like Elmer's Tack All, thick double-sided tape or possibly velcro to help secure the speakers to the stands. Of course, all the normal provisos would apply for stability, i.e. the speakers can be knocked over by kids, pets, etc. However as long as no one runs into them they should be just fine.