The bar is actually an IR light source. So imagine shining a weak LED flashlight through the screen which will probably block it entirely. IR follows the same rules a visible light except we can't see it with the naked eye. Any opaque material will block it.
it's easiest to place a sensor bar on a table in front of you somewhere between the screen and where you are.
If you feel like experimenting you could point some IR or red lasers at the screen. The remote has a camera in the tip that looks for four IR dots, which normally come from normal LEDs, but might as well be laser dots.
The acoustically transparent screen doesn't matter. The remote works based on IR light, not ultrasound.