I have purchased the Arc to replace my Playbar in a surround sound set up

I previously had the Playbar mounted to my TV cabinet that was designed for the Playbar and it sounded great

I have used the new Arc wall mount to facilitate mounting the Arc to the same cabinet, the upward firing speakers have a clear line of sight to the ceiling with no obstructions, but i was concerned that the magnetic trigger in the Arc mount may be giving me a false sound stage as its not actually mounted to the wall..?

Can you advise please, as i cant see an option in the App to disable this?