I'm a student in a film class and our assignment has been to come up with the best way to multi-mount some peripherals on a canon 5d redrock follow focus rig. The accessories include a zoom h4n audio recorder, a rode shotgun mic, a monitor, a light panel, and a wireless sennheiser receiver.
I would suggest The J-Cube mount available at http://www.thej-rod.com and at B&H Photo.
The mounts are strong and light, made of aluminum and not plastic. They have other mounting solutions and a cable to attach the audio recorder to the DSLR with a headphone monitor.