How do warts display normally?

K, first question.  I know that genital warts CAN display as a single bump or as a cluster, but, in usual terms, does it usually display as a single bump or in a cluster (there'll be at least a few of them, especially for the first outbreak)?

Second, I've read that anal warts can appear whether or not there was rectal exposure.  But, is it fair to say that the chances of genital warts displaying in the anal area is significantly increased if there was in fact anal contact compared to none?