I feel your pain
I tend to think all rattles are different but I had an annoying rattle like yours, pressing various parts would stop the rattle, but I could never find it to actually prevent it. I thought it was the front centre vent under the windscreen but I was wrong. Noises seem to travel and bounce around especially off the windscreen (guess that's why the Soundaktor is where it is)
It drove me crazy, I had bits of dash off, the interior front quarter window trims, then the removable panel on the drivers side that you can see next to the door but actually part of the dash . It turned out to be the soft dash top next to the the window trim and tucked just under the dash, just below the surface. This part was touching the metal crash structure that runs left to right and making a rattle etc. Only had access fully from the footwell but a 5cm piece of neoprene cured it (pushed up and wedged in place).
Not saying its the same but these rattles can be buried deep.
BTW does it change if you drive around a roundabout? - right hand turning with the rattle sound then exit left hand the sound goes? It might help you to pin it down.
