I bought and applied this - C-Bond NanoShield | Cbond It was about $60 shipped. There is enough in the kit to do two cars or a later re-application which is what I did. There are several YouTube video's on this product.
Madico ClearPlex. I know rpmtesla sells the rear corner glass piece pre cut. They say they can do windshield and roof also. But from what others have said… it scratches due to wiper use so look forward to maybe needing to replace it every 1-2 years depending on where you live.
Please report back with your experience if you do go with clearplex.