I keep thinking the rattle inside mine is in that area, but in vehicle noises can give the appearance of coming from somewhere entirely different. A previous rattle I had convinced me it was on the passenger side, when in reality it was actually the interior light housing. Almost every section of that is plastic touching plastic.
I’d recommend you either press that housing when you hear the rattle, or even drop the housing out and go for a short drive. If that’s where your rattle is, then take it apart and put pieces of thin adhesive felt or similar between all the points where the plastic meets.
I’m going to have a check further inside the headliner on mine when I can be bothered to. I got one of those little inspection cameras, with the rigid, snake like end. It’ll go about a metre inside the headliner, so should hopefully help me to locate any obvious rattle points - cables running close to plastic or metal is my first thought…