OK, I assume that you do not want the images in the ‘converted’ folder but in the ‘art 200’ folder.
If you look a little left to the ‘art 200’ folder, there is a round button that is black while the one above near ‘converted’ is white. It means that the ‘converted’ folder option is active. All you have to do is click on the round button next to ‘art 200’ and it should save the files there.
Concerning the other question, float is a data type used in programming. A 16 bit float tiff should have more data to play with in post processing, but it is not supported by all programs.
Depending of your intent with the output image, you might not need it …