Your example wouldn’t prevent overlap of lanclaims. that is the real issue. In fact foundation block would have to be not closer than 20 meters from each other to prevent overlap. Closer than 20 meters leads to landclaim overlaps. How to deal with this now?. technically landclaim ends ad 10 meters. And meter 11 there is no landclaim and its free to use. Land 1 meter next to you is allready claimed. But you also claim it.
That shouldn’t happen
I am of course not sure how landclaim actually really works. If each building piece in itself would lanclaim in a circular fashion the entire landclaim would roughly be shaped like the building i quess.
I think we can all agree on that it is possible to overlap landclaims and this is something that is not supposed to happen. If you claimed a land around a certain distance around your buildings no one should be able to claim that land as well. but this is what happens.
I also have dealt with this recently. Nothing you can do about it since you cannot destroy structures in PvE when diplomacy like in my case failed.