First, welcome to the forum.
I just looked at these charcoal trays and I would not use it on my Genesis. If I want charcoal flavor, I just use my Performer. You could use a cast iron smoker box for smoke flavor. If you don't have a kettle, check out Craigslist. They have some great prices on there from time to time. That would also give you more cooking real estate. Enjoy the forum. This is a great place to learn and to share. By the way, we love pics here.