Russians would be attempting an amphibious crossing over the Narva River in that area if they were making a go. Only a pair of bridges existing, one a rail bridge and another from Ivanogorod onto Narva the only bridge suitable for vehicles.
I’m sure that the Estonians will have drones up looking for any signs of bridging equipment being hidden a few ons from the border.
The
Germans/Estonians Nazis held Narva for months and months the last time the Soviets/Russians tried to move into this area.
en.wikipedia.org