Unreal Multiple Flat + Texture texel density

Hi i modified the "Texel Density Tool" by fishman, the idea is to do a quick multiple Flat Unwrap coordinates Only for textures on channel 1 with whetever density i need and i also want to have a second Unwrap modifier only for the Lightmaps for unreal.

Now i managed to do the main work but for some reason it only adds 2 modifiers to a single object not all, also the unwrap is allways on face mode why?