Solitary would work. I still do not think he will turn anyone in.. i am sure even he has family or loved ones that can be used to keep him quiet.
He is above the law, his last imprisonment made it clear.
Unless he thinks it is in his best interest to squeal.
This first attempt on his life should teach him that.
I hope he has a kill switch, to release documents if anything happens to him.
But they seized his property, so I’m hoping there is enough.