PFF comments on Rapp. (and other FA safeties). Like the tackling part.
https://www.pff.com/news/nfl-2023-free-agent-rankings-safety
Rapp was solid if unspectacular over his rookie contract after the Los Angeles Rams selected him in the second round in 2019, and he earned career-high grades against the run (82.3) and in coverage (72.9) in 2022. Los Angeles was comfortable lining him up all over, and he's one of those players who performs OK in various alignments but is not particularly great at any one thing. One thing that has been consistent: Rapp is a sure tackler, never missing more than 8.7% of potential tackles in a season. His 148 tackles over the past two seasons rank ninth among safeties.