Fournier is a solid player. I’d pass on signing him to a $20M per/mult-year contract. Once it’s signed, there’s no exiting that contract without surrendering an asset or trading him for a liability, until it’s an expiring contract.
Prior playoff performance has to be taken into account and weighed heavily in committing to Fournier with that size of a contract. He has a career 12-3-2 average in the playoffs with subpar efficiency as a #2-3 option on the Magic (granted it’s been with terrible spacing) and is an average to below average defender.
Tatum and Brown are on the verge of being Top 10 and 20, respectively, and this next move has to be what Igoudala was for the Warriors and Fournier isn’t that. I’d look to package home with multiple 1sts to sign and trade him with a 3rd team that has a player like Joe Ingles, Dillon Brooks, Brogdon, or FVV.