I had ~4’ bungie cord in my boat and icehouse when I brought little kids with me. I would c-clamp it to the closet spot next to where they were fishing and looped the other end around the reel. Saved a couple of rods. Might be time to invest in some nicer rod holders. There is no way the rod can come out of the holder I have without braking the holder. The holder also swivels at the handle so when you get a bit the whole rod moves. This has helped my son since he normally pays more attention to the game he is playing than fishing. The whole rod moving really stands out. I open the bail if no one is watching the rods.
I have lost a rod down the hole and recovered it. It was the first time using an inline reel. I opened the reel and laid down the rod to go pee. Came back to see the rod sliding across the ice into the hole. The spool didn’t free spin since it was laying on the ice.