any side is alright as long as its the corner-most. I, and i'm pretty sure most, prefer the right side. East Southeast and there's a nice little corner there you can backslide from -- it feels more spacious.
As soon as she's bugged a GX can just rc2win, either backslide from her EQs or just facetank it. I prefer facetanking to keep her in position and also for the increased DPS. A max level GX with 90 vit with no maxHP mods can tank her EQs to red, just be sure to spam spots after/during the EQ. I kill the queen within 3 EDPs so like 3-4 mins?
I've only tried the instance on GX but I think for RK, you'd want an angry queen for your WDBs so youd keep her in the donut, plus instacast Spellbreaker too. A CC gene will be more versatile since you can cover all elements.