Joined in November 2017 and it's your first post?!? Belated welcome to you!
If you're concerned about aesthetics, you can cook the turkey on the top grate on a shallow rimmed pizza pan or similar to prevent drips on the turkey below. Yes, the one below may cook a bit slower. Just cook it longer or move it upstairs when the one on top is done. It's a fool's errand to try to get them done at the exact same time, just hold one until the other is done.
Check to ensure your turkey fits on the bottom grate:
https://www.virtualweberbullet.com/turkey-selection-preparation/#twoturkeys
I've given up on the whole Norman Rockwell carve-at-the-table bit, I cook turkey(s) the day before, slice, arrange, refrigerate, and reheat with chicken broth the next day. Good enough!