I agree with the prop valve issue. Mount it after that. If your going electric, mount the release button on the side of your stick shift. That way it's close in case your using it for offroad and have to throw the stick quick.
I've had one on my 82 CJ-7 for 10 years now and really like it. It is plumbed between the master cylinder and the front brakes. I did it this way so I could lock front and rear (emergency) brakes. The switch is part of the Hurst T-handle and is very handy: