I didn't put anything on the passenger side but I did need something to mount a laptop on the drivers side so I could install a Silverleaf monitoring system. I bought on similar to this.
Car Truck Vehicle GPS Computer Laptop Mount Stand Table | eBay
I mounted this to the floor next to my side console and used an L bracket to help secure it and keep it steady. I have the laptop mounted so I have easy access and view but yet can use the rear view mirror and see the controls.
The make different versions of this, you just need to find one that will provide the work surface and position requirements that you need.