I've never heard of using raw shrimp in ceviche. I believe there are health concerns with eating raw shrimp unless you are using something along the lines of a spot prawn.
That being said, once the shrimp are poached, you do not need to marinate them for very long.
Using raw shrimp in ceviche is definitely a thing. It's done that way all over. Of course, if you have concerns, you should abstain from ceviche, sushi, tuna tartar etc.
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That being said, once the shrimp are poached, you do not need to marinate them for very long.