IKEA PAX wardrobe and wall rail. Assembly tips

Hello everyone,

we are moving next week and I have ordered several Pax cabinets from Ikea. Now the problem is that in the dressing room there are relatively high baseboards/wall moldings (about 12 cm) integrated that I cannot remove. However, I would like to have the cabinets directly against the wall and not with a 3 cm gap. Now my question: Can you cut or trim something at the back of the plinth and cabinet so that the cabinet basically stands over the moldings, or is it better not to do that?

Thank you very much in advance, dear people. Best regards

The cutting should be possible since the "Billy shelves" are also cut out at the back to avoid "baseboards".