CUPID-Mo is an experiment to search for neutrinoless double beta (0v2b) decay of 100Mo, ongoing in the Modane underground laboratory (France) since March 2019. The detector array consists of twenty 0.2-kg 100Mo-enriched lithium molybdate scintillating bolometers (containing 2.26 kg of 100Mo) operated at ~20 mK. CUPID-Mo confirms on larger scale a reproducibility of high energy resolution (~5-6 keV FWHM at 2615 keV) and highly efficient alpha background rejection (well beyond required 99.9%) of lithium molybdate cryogenic detectors. Moreover, a large exposure acquired (~2 kg*yr) allows to demonstrate the U/Th activity in the crystals on the level of 1 uBq/kg (226Ra) or below (232Th). These results are of a great importance not only for the CUPID-Mo sensitivity to 100Mo 0v2b decay, but also for the implementation of a large-scale experiment CUPID, following closely the CUPID-Mo detector configuration.