The more I think about it, Atlanta might be the best fit for Harbaugh given the similarities between the two offensively and it matches up to what Harbaugh did here.
They would have to figure out the QB but outside of that, you got Bijon Robinson & Tyler Allgeier at RB. That gives Harbs a easy run first approach style of play we saw here. Our offenses favored the Tight Ends more, and they got Kyle Pitts and perhaps Likely joins him in free agency as the second TE. If he brings Monken with him, it's an easy transition.