You can put dann between Sie und Ihrem as well. However I would assume that because of the positioning at the beginning of the sentence (= emphasis) beschreiben is part of a series of actions.
Also, if you were to put dann between Sie und Ihrem, the phrase could be (mis)construed as an imperative. Granted, the same holds true for the first sentence, but since there is no exclamation mark the meaning should be clear.