My 6' is normally parked on 58W and there is a ton of margin on all the signals. It's going to be lower on the horizon in Las Vegas than here in Denver, but as long as you have line-of-sight, you should be fine.
Since you live in Mexico you should try any SKY Mexico TP since they are on 24x7 just to check signal levels. Although as per Lyngsat there is a FTA TV channel named SKY View. The rest are feeds on CONUS beams and as you said it requieres a Universal LNB.
that TP is actually gone. I dont have a Universal LNB set up to see what is up there so if someone can scan 58W and send me the TP's active that would be great