I don't think Adams really works for them.
Zion's defense is definitely an issue though; it seems like we Ingram and Zion the way to go is play the two of them at the 4/5, but how bad is the defense going to be?
FWIW, (and I'm getting different numbers using BBref and NBA.com, but I'll go with NBA.com), the Pels have a defensive rating of 114.0 when Zion plays, and 106.3 when he sits. But it's the minutes when Zion and Adams both are out where their defense has been better.
I was bored and curious, so here are how the various combos of those 3 play without one of the others
Zion and Adams play, Ingram sits (this has happened for 19 minutes all year, so huge grain of salt) +10.3
Adams and Ingram play, Zion sits (232 minutes) -1.9
Zion and Ingram play, Adams sits (again, only 83 minutes) +4.5
The three have played together for 435 minutes and are +3.5.
Might be worth playing Zion and Ingram more without Adams?