If your supplier has really a CE and RoHS Certificate, he must know how to ;abel the merchandise ! In the regulations from CE and RoHS, exact size and marking of the labels is part of the paperwork !
Wilhelm is right. And, for mains electricity products, you may need a separate electrical safety certificate even when you have your CE and ISO certificates.
May the Gods of Trade ... Shangdi, un dieu, dio, Gott, Dios, Deus, Allah, alaha ... smile on us