It looks like the pix show a clamp pre assembled, the screen has two pre drilled to attach the screen deflector mounting hardware to, an Allen key and two small bolts and nuts per mounting bracket. The remaining mount slips over the top edge of your existing bike screen and that is also secured with screws by an Allen key,
Once on set to suit your requirements, should be able to see over it and a target on the road in front about 25 away..
Set it at approx the same angle as your current screen.. cheers
Ps, I had one on my Bonnie america with good results