Hi @ottomejia24, I know what you mean. Tobii Pro does offer a screen-based tracker such as the https://www.tobiipro.com/product-listing/tobii-pro-x2-30/ which can be configured for a non-screen setup such as a projector or mobile/tablet solution.
In terms of tracking an object in real world 3D, the Tobii Glasses are the only suitable solution for this.
Of course, you could theoretically calibrate the 4C on a monitor and simply place a roughly 2D object such as a book or t-shirt on top of the screen but we could not support such as setup and as I stated before, use of the tracker for such purposes would require the purchase of the analytical use licence.