This is how the drivetrain is connected to the body of the rover, Cable ties,  between the motor and the motor mount there are silicone sheet to prevent the motors from pivoting since the exile is not in the center of the motor (Otherwise you will have bad ground clearance) the good thing about this drivetrain system is the if you decide to change the geared motor you just 3D print a new mount, Also the cable ties give you good ground clearance.