Using the lathe's faceplate is for many workshop owners a process best avoided if at all possible. One reason for this is, I think, that securing a workpiece onto the faceplate's limited size can often be difficult.
The compact clamps seen in this video attempt to minimise the problem.
Additional details regarding the clamps can be seen on my website here Faceplate and Angle Clamps
The clamps are also useful when securing workpieces to the angle plate.