Rams really like to go the FA route for plug and play players.....They have done it plenty of times during McVay's tenure.
My guess is......
LT and an EDGE will be addressed in Free Agency because those 2 positions (especially LT) you don't want to roll the dice on with a rookie. Plug and play immediately is what the Rams will do to take care of a problem.
Then, in the draft I can see another edge in RD2 and then OLINE, OLINE and more OLINE.....McVay and Snead will make this a priority because the WILL NOT go through another season like this where the OLINE UNIT had no answers for the injuries.