I meant you are asked in CloudCompare during import, like:
If you open rcInfo file next to your model file in the notepad, can you see your coordinate system in globalCoordianteSystemName section?
As the units in CloudCompare then the model should be in correct system and units. Probably there is something, that ArcGIS is not able to read that or georeference the model. Is there some kind of settings to set the system for the model manually in ArcGIS. For example, in QGIS it is possible to do.