ND/PL filters for Mavic Air 2?
 

Hi friends, I need to ask 2 questions please.
I recently have the Mavic Air 2 and need to buy ND filters. I make only 4K videos. I had bought the Freewell Variable VND filters but I returned them after a few days of testing. In fact, these filters gave too saturated colors. I do video editing and found it difficult to do grading in post production. Now I'd like to buy PolarPro but ..... My 2 questions:

1) Do the PolarPro Vivid Collection ND/PL filters give more saturated colors than the normal ND filters? It is hard to check it on the video. PolarPro Vivid Collection filters are built with only one lens, is that right?
2) Why doesn't PolarPro make filters without "PL" ?. It seems incredible that PolarPro makes filters with "PL" only. But is that "PL" function necessary if I use it in countryside without water?
Thank you!