applying fx to 2D layers and 3D layers

Playing around with Hitfilm goody bag and getting my head around the compositing workflow.  I see some fx has to be applied to a layer for example pond ripple fx you have to composite it to a flat surface which you set up in 3D space because you cannot rotate it in perspective so for example I used a neutral grey surface “125”  with pond ripple applied and used “overlay” to counter the neural grey. Or How else would you do this?

 

Also the camera is 3D so only shows layers in 3D layers in 3D motion correct?. So if I want the text to move but maintain 2D composite what I want to move I set in 3D layers? Correct = instead of moving objects in 3D space move camera because the other elements are in 2D space. or have I got it wrong?

 

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