UDFAs WR Tipton, TE Holker, & CB Payton all made the 53 man roster

For comparison's sake, would love to know the average number (this season only) of UDFA's that made the 53-man roster across the entire league.

I’d love to know if there has EVER been an undrafted free agent make his respective original team’s opening day roster without playing in a single preseason game.