THIS IS AN OLD DESIGN, HERE IS THE LINK FOR THE UPDATED VERSION: https://www.printables.com/model/860531-speed-champions-car-mount-v2
The type of holder needed varies based on the wheelbase and the width of the car. Early sets are 6 stud wide. Sets from 2020+ are 8 studs wide. I've only included the compatibility of sets that I own. Feel free to add a comment for updates to compatibility, or to request different sizes.
The modular sections can be attached to each other with an M2 screw and m2 heatset insert, or with a small woodscrew into the wall. Alternatively, The sections could just be screwed together with heat sets, then attached to the wall with command strips.
Type A: 8 wide 11 stud wheelbase
Type B: 8 wide 12 Stud Wheelbase
Type C: 8 wide 15 stud wheelbase
The author marked this model as their own original creation.