I'm using a floating servo mount but it's attached to the rear of the servo instead of the more traditional way onto the front suspension unit. By connecting the servo directly to the front end you will affect the flex more than if you have the mount as far back on the chassis as possible - there's a "twisting" force on the servo when turning.
When you have a floating servo - front or rear mounted - the chassis will sag in the middle (if its not super stiff) and the ride height will be lower in the middle and a bit higher by the front wing. By attaching the front shock you can adjust the spring tension and have a flat chassis - you can also adjust the stiffnes of the chassis lengthwise by changing the shock spring. The shock is dampening bouncing and vibrations in the front end as well.
