Doesn't matter where they hit. Launching missiles is a piss poor deescalation strategy. If Trump absorbs this after his earlier threat, and declares no blood no foul, he'll look like a complete bitch. The time for peace and withdrawal is past. Maybe it'll come again, but it's not an option right now.
Imo we should lob the same number back at 100x the payload. When everyone cries "That's not proportional! Yours were bigger!" You say "Yes they were, and we could have sent far more."
Targets should include the launch sites of the missles they fired and the offices and people who decided to fire them. Then you round up the Iraqi politicians and ask them if they're certain they're backing the right horse or maybe they'd like a do over.