He was exceptionally submissive when he lived with Butterfly, just followed him everywhere due to his eye sight being his primary sense (which is the only thing likely to cause problems). He used to let Butters hump him mercilously and didn't fight back, just ran away.
Having a water bottle nearly killed him at the Centre because he couldn't use it so was exceptionally dehydrated, so it's good to have a bowl there for him. For a trio you may need a bit bigger space, so be ready for that.
I hope it all goes well.