I got the Smartish Kung Fu Grip for my 12 Pro and I love* it. Fits snug, the grip is great on the edges, it keeps the same relatively flat profile of the 12 Pro (doesn't stand up without a bit of support), the protection is great, and it fit perfectly over my full-coverage screen protector.
*However, their first batch buttons were legitimately too hard to press (read all the Amazon reviews): I only bought it after I saw they are doing expedited replacements with a fixed revision. I don't want to spend $20 on some other case and then wait buy the updated Kung Fu Grip.
And, you get to keep the bad batch unit, so you'll end up with two cases for the price of one.
Unrelated: I'm not a fan of the screen protectors that leave the notch exposed: it reminds me the notch is there way more often.
With the AT&T trade-in discount, you'll never pay the full price upfront: you must use the installment plans. Then you trade in your phone and make sure its approved for the full price (yours should be $800).
If it's approved, then you'll still be charged the full monthly payment ($30 to $35) for two to three months. Then they begin the bill credits and they'll retroactively discount you the first two to three months.
