Let me be the first to say this is almost certainly compatible with other vehicles with a similarly flat tray to the VB WRX, but I designed it to best fit my own. There's plenty of room in front and behind of an iPhone 14/15 Pro on the charger for me to suspect a Pro Max would fit, too, but I don't have one to confirm.
The MagSafe charging puck is positioned slightly proud of the top edge of the printed base to prevent camera bumps on many of my cases (and hopefully yours) from interfering with the phone magnetizing flat onto the charging coil.
I've printed mine out of Prusament Galaxy Black PLA for reasons of personal filament stock at the moment, as it should be out of direct sun and is under very simple downward force so deformation shouldn't have much of an effect. But if you want to be sure it'll last, print in PETG or ASA.
I recommend thinner VHB tape between the MagSafe charger and the printed base so it doesn't come out when you remove your phone and more cushioned VHB tape between the printed base and rubber tray to ensure a good hold there. Coil and tape/zip tie the cable slack up, tuck it on the underside of the base, and mount it snug to the front of the rubber tray behind the shifter. Leave a bit of room between the base and the left side of the cubby so your phone and the USB-C plug end both have room to exist. I gave the USB-C plug a half turn or so for tension to help hold it up and out of the way.
The author marked this model as their own original creation.