Normal word order in a poem is the same as in prose.
Words may be displaced to fit the meter.
The expected prose order might be Varus meus me otiosum visum e foro ad suos amores duxerat.
The more normal order would be qui primus ab Troiae oris fato profugus Italiam Laviniaque litora venit, and prose might have in or ad Italiam et Lavinia litora.
Often the last word before the principal caesura of a dactylic hexameter, or the first word after that caesura, belongs with the last word of the line. Similarly, the last word of the first half of the "pentameter" of an elegiac couplet often belongs with the last word of the line.
Poets like to construct golden lines. A golden line is a dactylic hexameter made up of two nouns, each modified by an adjective, symmetrically arranged around a verb.
Poets may arrange words to emphasize puns and word play, or for sound effects.
Here the identical metrical position emphasizes the repetition and the variation in the last line.