Think he is fine, and he will surprise people as a bargain, whereever he goes. Why? Explained after this comment.
But you didn't know that the guy could have lost his motivation totally at mid-season. Their unborn child did die on the new years eve at 2019. Before that incident, Haula had scored 17 points in first 21 games (0.81 points per game). He was thriwing at Carolina. After that, he scored only 1+5=6 points in last 27 games. Also got traded to crappy Florida.
Think he will be a steal for any team he signs as UFA. Quite sure he has got mentally over the tragedy in 10 months. Life goes on. But you can draw clear line, how his season went bad after the tragedy (totally cold, only 0.22 ppg), and how great that season was before the tragedy (0.81 = career hottest ppg).
If we cut this tragedy off and pull a bigger sample size for his career, starting from 2017-18 season and ending the sample size for the last day of 2019, he has played:
112 games, scored 42+37 = 79 points (0.71 points per game). That points per game is at same level as Anthony Mantha's last 3 years combined. Both have had injuries, but that's great production for sure. Haula is also fine at center, has been 52% faceoffs during this time.
Any GM who will gamble for this guy, is gonna look genius. You don't have to overpay or anything. Just sign him for reasonable price and trust him. Think he is looking back going to Vegas, who has a bit center concerns now after trading Stastny. But they have to fix the cap first.