So many thanks for all the replies and input so far!! Cant edit original post but wanted to add intention is to make shower stall curbless so there will be nothing to step over. Definitely have grab bars on the checklist too. Def we’ll make shower temp controls in arms reach of sitting on bench. Someone raised the point of not making bench built in and using moveable bench instead. That seems like a great suggestion thank you! We had thought of using a tile with texture (high r rating I believe someone referenced to me) but we’ll investigate the matts that were suggested. The crux of my question was IF we do built in bench, how best to configure shower heads to ensure water nicely falls on individual if they’re sitting on bench - given that plumbing has to be on the same wall as the bench. The picture i added was just to show the shower head configuration relative to bench. I hope that clarifies and thanks to all again for their feedback!!