Make sure Litchi is supported on the drone you plan to use.
Also, from a safety standpoint, especially with a model as you've stated, the accuracy of the waypoints can be horrific, as GPS is the navigation input... With a bad satellite config in the sky (which is temporary), GPS errors can be huge. Big enough that the spiral, which is centered on the model on the map display, actually executes 25ft to the left and smacks your model in the back of the head.
The helix feature uses tracking of the subject from the main camera, so is very unlikely to strike the subject, and your subject will be right in the center of the spiral every time.