You shouldn’t automatically choose small schools – visit some large schools for comparison. If you have any concerns about him not being ready to be away from family support, don’t be afraid to check out your local community college, too.
Larger universities may have a bigger and more qualified staff to assist students with learning disabilities. Public universities and community colleges take American with Disabilities Act very seriously, while some private schools may be doing the minimum not to get sued. My daughter had student jobs with learning support departments in both her community college and her LAC. She feels sorry for the kids at the LAC because she knows what a well-staffed disability support department should look like. It’s a caring place, but they really don’t offer much. My guess is because it’s a small school, they don’t have the numbers of students to justify creating the wider variety of services offered at the community college.
Google “college transitions dataverse” and pick the link titled “data and research” and from there pick the link titled “colleges with strong learning support services.” Notice how many large schools are on the list. When you click on each university name, it goes directly to the home page for their learning support department to make it easy to research.