Various is the correct author for any book with multiple unknown authors, and is acceptable for books with multiple known authors, especially if not all are known or the list is very long (over 50).
If an editor is known, however, Various is not necessary. List the name of the editor as the primary author (with role "editor"). Contributing authors' names follow it.
Note: WorldCat is an excellent resource for finding author information and contents of anthologies.
Some of these poems are fascinating -- a rewrite of the Iliad and the Odyssey explicating the action by the relative sizes of characters' wangs, for example -- but the translation makes an attempt at formal verse and comes across as sub-doggerel. They don't work as poems, because they're not very good and because an attempt at literalness forces the verses into absurdities of poetic inversion and bizarre word choices; but the exigencies of prosody prevent them from being literal, either. So that's too bad. There's accompanying Latin text, though; and the poems are fun.