Since the rear wheels will come off, I used two Technic Lifarms, thin 1x5, with Axle holes https://www.bricklink.com/v2/catalog/catalogitem.page?P=11478#T=C) and fixed them with two technic pins in the rear wheel bays. You can use the lift arms with regular holes, but a M3 screw will actually screw into the axle hole which gives it a better fit.
Print one of the front wheel mounts and two of the rear wheel mounts. I used PETG, but PLA will also work I guess.
You need a 25mm M3 screw for the front mount and 4 30mm screws for the rear mount. The mounts have 4mm holes for the ceiling, but I used 3.5mm wood screws.
The author hasn't provided the model origin yet.