I think you start at the website and see what effort has been made to get an idea of what they may offer. You can then compare schools at this very basic level. I looked at some LAC’s just now and found it varied quite a bit.
You should try to sign up for any online info sessions and have your student ask the questions. I think you disclose the disability because the risk of having your student wind up at a school that isn’t able to meet their needs could be too great.