"Since I helped to create our field of Assistive Technology back in the early 80's, we have been looking for something that can:
1) Hold something *very* firmly for the user.
2) Be infinitely positionable.
3) Yet be able to be removed instantly and attached to something else." RJ
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Device Adapter (for Arms and Tall Tablet Stand)
The combination of the Device Adapter and rectangular Universal Base seems to be a nice solution. You can attach the Base to just about anything, keyboards like our BIG Blue keyboard, an AAC device from PRC or Tobii-Dynavox, or a tablet PC that is over 4 lbs. (if your device doesn't have a flat area of 8" x 5" on the back, then select the 'small Universal Base' with a 4" x 4" footprint)
The Device Adapter screws into the end of one of my Arms or the Tall Tablet Stand. The Base 'super'-VELCRO's® (BRAND) to the back of your device. And the Device Adapter and the Base mate very securely, yet can be separated in an instant.
A variation on this is my Base with screws/holes for the iAdapter series of cases.