For many years I have used the 6 mm Festo filter in all orientations. I used to worry about the big air bubble that you can clearly see that resides in the filter. As you, I worried that it could dislodge and flame out the turbine. I would try different orientations, shaking it, etc. Nothing I have ever done could make that bubble leave the filter.

Bottom line is this: for the Festo filter, orientation does NOT matter one bit. Just install and fly.