JJ will play deep, Rapp nearer the line, and Burgess will play as well.
Rams have very good depth throughout the Secondary.
Without doubt, the Rams will guard against the deep ball first and foremost against the Niners. Probably play 2 deep Safeties like the Dolphins did. The Niners have serious speed on the outside.
Wouldn't surprise me to see Ramsey on Kittle a few times.
It'll be important for the Rams to get pressure on whatever QB the Niners use..... just as it is for all games.
