You can sneak your squad in and get them into position before the fight kicks off. I split my party up a bit, had most of them group up on the isolated guy close to the door, and I believe I had Lae'Zel placed really far up to take swings at one of their spellcasters / ranged fighters. Other than that, you best come fully rested, the fight is still going to be tough either way.

I cannot change this name anymore, please send help.
The avatar is created by an AI called midjourney, and it is done so by essentially typing text, pretty dope, huh?