O.J. will be kept in a somewhat private environment. No roomies, and little exposure to the general inmate population.
It wouldn’t look good if the jailers allowed someone to gain stature in jail by slitting Juices throat like he did his ex and Goldman.
The guards (i.e. "Corrections Officers") won't be able to isolate him from the general population unless they put him in "the hole" for good. There is no way OJ would agree to that. Solitary confinement is its own kind of hell.
Prisons have a subculture which contains their own "government." Most of it is run by gangs that are divided among racial lines: Black gangs, Hispanic gangs, and White gangs.
Blacks and Hispanics are not minorities in prisons - in many cases they are majorities. Therefore, they have real power through numbers.
OJ will join the black gang and seek protection there. The guards will not be able to protect him 24/7 - and in reality the guards even deal with the gangs on the inside because they know they have real power and authority on the inside.
Guards could not prevent Jeffrey Dahmer from being killed either - and he was as high profile as you can get.
And it won't surprise me if he's released in 9 years, violates parole with one or more felonies and gets reincarcerated.