Cooking a big brisket this weekend. Not my first, but my first on the egg.

Couple of questions maybe the community can help me with

Pre-trim weight is 18lbs, I'm guessing 13-15 after trim. I'm worried about overhang beyond the egg vector plate. Should I create a foil shield?

I'm gonna set up the temp right at 225. Fat cap up or down?

Any other advice would be greatly appreciated.