Welcome to the forum. Gonna move the thread to our suspension section.
I don't have experience with these shocks in particular, but I can say that rubbing is dependent on your tire size and wheels, not the shock. As far as UCAs, you don't HAVE to, but depending on how you will be using the truck, it is usually recommended to do them at the same time instead of down the road if your stock UCAs ever end up failing from abuse or added weight.