Anchoring an outdoor table on a sandstone patio requires careful consideration to ensure stability without damaging the surface. Here are the most effective methods:

1. Use Sandstone-Compatible Anchors: Opt for heavy-duty anchors designed for porous surfaces like sandstone. These provide a strong grip without cracking the stone.

2. Weighted Bases: Attach weighted bases or sandbags to the table legs. This is a non-invasive solution ideal for renters or temporary setups.

3. Adhesive Anchors: Apply construction-grade adhesive to secure metal brackets or plates to the patio, then bolt the table legs to them. Ensure the adhesive is weather-resistant.

4. Drill-and-Bolt Method: For a permanent fix, drill into the sandstone and use expansion bolts. Seal the holes afterward to prevent water damage.

5. Freestanding Stabilizers: Install freestanding stabilizers around the table legs, which press against the ground to prevent movement.

Always test the method in an inconspicuous area first to avoid damage. For windy areas, combine multiple techniques for extra security.