"He who dies with the most toys wins."Anonymous grillmaster
You already have a grill grate. Do you need a rack or tray or other grill topper on top of the grate? Yes and no.
Some grill toppers and racks are essential. For instance, a rib rack helps you cook more meat at once, a very handy feature on small and medium charcoal grills like the ubiquitous Weber kettle. A grill tray also prevents small foods like asparagus and shrimp from falling into the fire. You can even get a perforated grill pan for tossing small foods over the fire. Ever roasted chestnuts over the fire? A perforated grill pan with a handle is the perfect tool for the job. Grill toppers come in all shapes and sizes, from trays and baskets to woks and saute pans, and many of them are extremely useful.
On the other hand, you may not need something like a Ribalyzer grill topper to cook the best ribs you ever tasted. For that, just follow my recipe for Last Meal Ribs. Here's the best of the rest among toppers and racks.