CUZEC 14AWG 1 to 2 Car Cigarette Lighter 14 AWG Cord 12v / 24v Car Cigarette Lighter Splitter, Power Charger Adapter 2-Way Waterproof Socket Splitter

Just use one of these splitters: https://www.amazon.com/CUZEC-Cigarette-Lighter-Splitter-Waterproof/dp/B08CMT94CV I've personally used that splitter for years now and it works great. Then use any USB-C car chargers you want. It will probably put less stress on your vehicle 12v outlet as well since you don't have a super long rigid stick coming out of it from several 12v plugs being stacked on top of each other. Check how much your vehicle is fused for so you don't end up overloading the socket.