Time is of the essence. Rafah must be crisscrossed by the IDF to make sure all tunnels are found . send in drones into various houses and destroy the entry and exit points as well as the houses. Flood the tunnels and see where they lead. The hostages are in civilian homes, spread some money and there will be many takes if it comes with an offer of being able to leave Gaza
The Rafah wall Must be built 2 km from the Egyptian entry/exit point plant listening devices in the 2kn barrier.
That must be the first step of security measures. There are other thing Israel can do.