I use one of those "Car Seat Gap Organizer" on the passenger side,
I don’t know if you want this instead but it’s similar? Instead of putting it by the door it’s on the side of the seat..
This might work better for you or not.
Meidong Upgraded Car Seat Gap Organizer, Car Seat Organizer Front Seat Gap Filler for Phones/Keys/Drinks/Wallets/Sunglasses (Driver and Passenger) https://www.amazon.ca/dp/B0828WFGHH/ref=cm_sw_r_cp_api_i_YTSJRF2359GA4GNAAQ6E