It appears you are working with 1.5" square stock. Use a sacrificial piece of the same dimensions (only the length necessary) and set both pieces parallel for stability, and make the cut vertically by laying your track across both. If you have multiple pieces to cut, you can set up stops on your MFT top, and use clamps, to repeat the process. In this case I would likely not be employing the MFT fence.
Good luck with your project.
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Rich