Hi Irwin!
For best printing result, it is strongly suggested to mount them in direct drive. Most motors are highly capable of driving a high load.
The extruder can be mounted directly on a carriage plate, there are mounting screws on each side. A custom carriage can also be printed.
The Pro series has many upgrades compared to the GT. Most of all, it performs better with flexible and it has a few "ease-of-use" upgrades.