> Aneyoshi’s tsunami stone is the only one found that explicitly describes where to build houses
As for others, “Some act as monuments, giving death tolls from past tsunamis or marking mass graves of the victims. Others offer more direct advice. A tsunami stone in Kesennuma, a city in the Miyagi Prefecture, reads: ‘Always be prepared for unexpected tsunamis. Choose life over your possessions and valuables.’” - source: https://www.atlasobscura.com/places/tsunami-stones
Note that tsunami stones, except one, are not markers of danger, at least not in a precise, spatial sense. They’re like memorial plaques, listing past casualties or marking gravesites. See grandparent comment.
As for others, “Some act as monuments, giving death tolls from past tsunamis or marking mass graves of the victims. Others offer more direct advice. A tsunami stone in Kesennuma, a city in the Miyagi Prefecture, reads: ‘Always be prepared for unexpected tsunamis. Choose life over your possessions and valuables.’” - source: https://www.atlasobscura.com/places/tsunami-stones