Amazon.com : YINGDIKE Patio Umbrella Holder, Outdoor Umbrella Stands - Heavy Duty Umbrella Base and Clamp for Railing or Deck in Patio and Courtyard - Fit Max OD 2.1 Inch (Flat Mount) :
The 3 Best Patio Umbrellas and Stands of 2023 | Reviews by Wirecutter
Amazon.com: ABCCANOPY Umbrella Stand Outdoor Heavy Duty Umbrella Weight Base Market Patio Umbrella Square Iron Flat Umbrella Base, with Wheels & Handle, 36.8 lbs, brown : Everything Else