I’m guessing the NFL has the same rule for using a drop kick on a kickoff, i.e., the ball has to be kicked from ON team A’s restraining line. When it became apparent that Las Vegas (vs Kansas City, today) was going to give a drop kick a try for an onside kick, the R conferred with a few others on the crew, then had a conversation with the Las Vegas kicker. When he kicked the ball he dropped it extremely close to his restraining line (it looked like some part of the ball may have actually be OVER the RL), then kicked the ball. KC recovered, but it was interesting to see this happen in the NFL only two weeks after a drop kick was used on a kickoff in the NCAA (which we now know was executed illegally).
Would like to have heard those conversations.