Necessity to freeze credit?

Due to some unfortunate timing my circumstances require me to have a few credit checks for an apt lease— at the same time tho I have seen ppl on this sub (to a varying degree)

stress the need to “freeze your credit” How impt is this and if I don’t will j2 be able to see j1 during bgc? it’s not listed in resume and TWN/LN frozen ( or so i hope)