I would suggest having an alignment after you replace any components in the suspension. The money you spend for the alignment will pale in comparison to replacing tires early. Just be aware the camber is adjustable in the rear as it seems some people are not aware. I would also want to ensure the toe is as close to neutral as possible.
That being said, I'm wondering if people are using factory specs or other? I see eibach had different specs depending on drop. I went with Ford racing m5300x
I didn't get it done after i got my springs put on and in retrospect I probably should have because the rear tire wear is a little uneven(slightly more wear on the inside). It didn't really shorten tire life for me since i've never had p zeros last more than 7k miles on my rears.