Spring loaded automatic lock on pedestal base mounts and flush mounts are 100% foolproof.

But they both require a flat horizontal surface.... like a coaming gunnel.... or a guide transom with a flat rear workspace/shelf.

If you are stuck with sidemounts, every fishing day with newby's should start with a FOLBE 101 lecture. Also helps to just get in the habit of continually checking the slide locks all day long.