Placing a baking tray directly on the very bottom of an electric oven is generally not recommended. The bottom of an electric oven is typically the hottest part, and placing a baking tray directly on it can lead to uneven cooking, excessive browning, and potentially burnt food.
Instead, it is best to position the baking tray on the middle rack or at a recommended position specified in the recipe. This allows for more even heat distribution and helps prevent the food from getting too close to the heat source.
If you need to protect the bottom of your oven or catch any drippings, you can place a sheet of aluminum foil or a baking sheet on the bottom rack below the one you're using. This will help catch any spills or drips while still maintaining proper heat circulation within the oven.
Always refer to the manufacturer's instructions for your specific oven model and consider following the recommended guidelines for optimal cooking results.