How to get an autistic adult into housing?

My 21 year old brother is autistic but not classed as having a learning disability as his IQ is technically over 70. However he's mentally about an 8 year old and has absoluelt zero social skills. My parents are struggling to cope with him at the moment and he may have to end up leaving our home because his behaviour is out of control. Has anyone had any luck with targetted housing or getting their family member somewhere safe? How easy is it to do? Any advice would be great.

Thanks