if you just want to power it from the fc and not use the remote control function i would choose the JST cable.
Just remove the yellow cable as this is the PWM cable to remote control the camera. Instead you can set it up through the app to record as soon as you plug in a lipo.
The red wire goes to any 5v and the black to GND.
For mounting it you will either need find someone who can print a mount for you or If you got a 3d printer print one yourself. there are mounts available on thingyverse, printables etc.. e.g.
https://www.thingiverse.com/thing:6613414