Land value taxes lower the value of land. The UBI recipient can conserve his share of land and rent it out to someone who needs it. That will result in an overall increase in economic efficiency and that surplus can in theory be used to buy products and services to meet the basic necessities of the recipient.

Alternatively, the recipient can run a homestead on his share of land.

You can increase the land value tax all the way to 100%. In the limit the UBI can be paid for entirely by land value taxes, which leave no surplus for land owners. It’s very easy for a UBI to end up benefiting only the non-working and land owning classes but it’s avoidable.