How to sync camera feeds from left and right camera in PCA API

Hello,

I currently project the left camera and right camera feed onto a quad to recreate stereo vision. With the new MRUK v83, it is possible to directly change the frame rate of each camera. However, at lower frame rates (5-10fps), it is evident that the cameras are not synced, i.e. they do not always display the same frame. 

Does anyone have a neat solution on how to sync the frames that are displayed? I am developing in Unity and the scripts are in C#.