There are disadvantages and advantages in crna's being employed by a group
Advantages
You control their fate. They know it. They act like it.
Harder for a hospital to replace the group. In a situation where this is a concern, it may be harder for the hospital to replace their whole anesthesia department rather than just the anesthesiologists.
Some insurers pay more to a group for employing crna's. it's not much but it's something.
You do have control of hiring and firing issues.
Disadvantages
There is a reason why hospitals don't want to employ them. It's expensive and it's not a money making proposition. Salaries are just the beginning, health insurance, hr issues, retirement plans, malpractice insurance, overtime, employees are expensive.
Because of cost most groups I've seen that employ crna's start relieving them early to get overtime costs down. This presents service issues and sets the group up for confrontations with surgeons ie the "why can't I run two rooms at 5pm on Christmas Eve" fit. Economically efficient or models don't always provide the best service from a surgeons point of view.
My Personal opinion is that if you work in an area with a good payer mix a group may be able to make it work. If the payer mix is not good and the hospital insists you should find another job. The hospital may pay the group a stipend to help support crna's but this will be an issue of contention until they find another group who will take less.