Sorry, tough roster fit, not lineup. Luis Arraez could be comfortably written into any lineup in the game. Once. After a few weeks, the fits get harder.
Your DH can be whoever you want. Many teams choose not to have a true DH only bat because of the flexibility of a precious roster spot, especially now that they are choosing the extra pitcher most of the time. If Arraez is truly a bat only player (and at least two teams think he is) then he has to be compared to the JD Martinez, Jim Thome, Nelson Cruz type players. Bat only players.
As a bat only player, most teams composite DH of rotating outfielders and resting stars is going to outperform Arraez over the course of a season. Measure it however you like.
One at bat? Luis Arraez is right up there in good choices but a tier below a Nelly Cruz, who also takes a very high level at bat but can do massive damage additionally. Considering Arraez runs about as well as retired Nelly Cruz, you might need a runner on your roster too.