Hi .. The very strong K/U satellite signals may work o.k. for you with the dielectric plate still in there - but weaker signals will need the plate removing ... i,v used a similar combined C/k/u l.n.b. - but found the K/U side of it quite poor .. nowhere near as good as a stand alone k/u - l.n.b.
My interest was in fringe reception / weak signals .. so the combined unit was disappointing for me ..
I made a separate l.n.b holder connected to the arms .. so that i had a small amount of individual adjustment of both the body of the l.n.b and the scalar ring , to get best results ... .. i will find some pictures later to show / explain how i did this
cheers