Record Professional Audio: SmartMixer 2 Channel Audio Mixer for iPhone & Android
This device has two condenser microphones, a video stabilizing grip, two 3.5mm stereo mic inputs, one mini-XLR input, and a headphone monitoring jack. It has all the necessary mounts and connectors. There is even a phantom power switch and an accessory shoe, for video lights and other gear.
Below is a review from Church Tech Media.