The premium 316 stainless steel baseplate is optional for the Riviera cantilever umbrella. The additional width of the plate further spreads the load.
A base plate is a great option if you are wanting to move a single Riviera between two locations. Moving between locations is best done seasonally, as the Riviera is a heavy umbrella and usually not frequently moved. Sometimes multiple umbrellas are the best solution. You can learn more about choosing the right location for your umbrella here.