Never mind I got them to work. In the ini I had glsl_shader_mame0 set to 6xBRZ when it should've been glsl/6xBRZ, forgot to include the subfolder lol. I also needed to set prescale to 1, any higher value and MAME would only load games with the default unfiltered look(I always turn bilinear filtering off).
Looks great on 2D games, thank you for bringing these over.