It makes a world of difference to me to have my machine tilted. We have small blocks, one inch thick, under the back legs of the table. Besides that, I have a foam wrist support under the back of my machine. This is a long foam piece about an inch thick meant to rest your wrists on when working at a computer.
All this helps me because I am short and it is easier to see this way and less strain on my upper back, neck, etc.