When I get a chance, I'll go back more years, but in the last 4 years, the best RPI to not get in was UTEP at 37 in 2016 (Is there any record of who was on probation and when?), and the worst RPI to get in with an At-Large bid was Purdue at 66 (also 2016).
RealTimeRPI has them at 65 now. If the committee goes strictly by RPI (which they won't), they needed to be in the mid to high 40's, which they were prior to the Vanderbilt loss.
Does this Creme guy have a good record of predicting who gets in and who doesn't?