First off, welcome to the forum.
While less than ideal, you might be able to run your existing saw(s) up against the backside of the MFT's guide rail. If that is of interest, you may also want to research 'slop stop' here to learn about unwanted play...
The MFT is, well, multifunctional. Another use that your MFT excels at is in holding your workpiece for a variety of other operations. But, you will definitely want to also purchase some of the clamps that work with your new MFT. They offer Clamping Elements, Screw Clamps and Quick Clamps to secure your work to the table. A pair of each type is a good start.
And, I see you have posted again before I submitted this reply. So, the hinge that was discussed is the rear Guide Rail Bracket. The rear Bracket includes a hinge that lets the rail raise up and out of the way, or down onto your workpiece. A front Bracket has a pin that fits into a T-track slot on the underside of the Guide Rail.
Here's one of many YouTube videos to help you starting out: