The Germanium version of the DBC6 dimer placement tool had detailed computer simulations performed showing that it should work reliably at room temperature. There is no problem placing dimers with a one dimer gap. Placing them directly adjacent can cause some defect formation.
The paper also describes using a first pass of placing every other dimer. Then adding the skipped dimers. This process is a defect-reduced procedure for fully populated dimer rows.
The simulations also showed the maximum placement tolerances. 0.5 angstroms in X (or across dimension) and 1.0 angstroms in the Y (or along trough) for an isolated dimer.
1.0 angstrom in the X and 0.3 angstroms in the Y for a correct gapped dimer placement.
There is a table which shows the tolerances and positional uncertainty at different temperatures using the different materials for tooltips.