The total safeties drafted in Round 1 prop bets was coming in at Over/Under 1.5.
Total offensive linemen in Round 1 had the Over/Under at 7.
You can bet the NFL Draft online from Washington State courtesy of BetOnline (18 and up).
You can bet on this year's NFL Draft online from North Carolina using Jazz Sports.
Though FanDuel does take bets on this year's NFL Draft, they are prohibited from doing so in some states where they operate. There are alternatives though.