Keeping an outdoor table stable on rubber mulch can be challenging due to the soft and shifting nature of the material. Here are the most effective ways to ensure your table stays firmly in place:

1. Use Weighted Table Legs: Attach sandbags or weighted bases to the legs of your table. This adds downward pressure, preventing the table from wobbling or tipping.

2. Install Ground Anchors: Drive sturdy anchors (like spiral stakes) into the ground beneath the mulch and secure the table legs to them. This works well for permanent setups.

3. Level the Surface: Before placing the table, rake and compact the rubber mulch to create a flatter, more even base. A level surface reduces instability.

4. Add Rubber Matting: Place a heavy-duty rubber mat under the table. The mat distributes weight evenly and minimizes sinking into the mulch.

5. DIY Leg Extensions: If the mulch is deep, extend the table legs with PVC pipes or metal sleeves to reach more solid ground below the mulch layer.

For a temporary solution, consider using adjustable table leg levelers or non-slip pads. Regularly check and readjust as needed, especially after heavy rain or wind.

By combining these methods, you can enjoy a stable outdoor dining or lounging experience without the frustration of a wobbly table.