It's really important that you will be able to get block time. In some ASCs this is competitive and they can only give you this time or that time, if you're lucky. So it does matter how badly they want you.
Some ASCs aggressively pick/refuse to do procedures that pay well or don't. It can be annoying when they suddenly say, "we're not allowing you to do any hip injections from now on because we lose money". They ended up losing all procedures = idiotic management.
Personally, I would prioritize an ASC that is NOT Joint Commission accredited. This turns admin/nurses into zombies that require you to do mounds of useless extra work.
If you can talk to a doc that works there, they can sometimes tell you a thing or two.
One ASC that I worked at has cancelled entire procedure days because they were too incompetent to find staff. GI folks had pts who already took their preps and were cancelled and barely an apology was given.