I am not really worried about this. I am just posting this here for the sake of documenting the issue.
After installing the pro-shields the lid no longer closed as tightly as it did before. The front lip of the GF lid settled about 8 mm higher than before. It does seem like it still closed enough, hence why I am not worried about it. I left them on for about two weeks to see if it would settle. After that, I removed them again as I just like the lid to close flush. I will use them when I need to use the GF in a public space, but otherwise, I will leave them off.