One of our customers bought these on Amazon.com (above)

If You Have Trouble Finding An Umbrella Base That Fits, Consider This One
US Weight Umbrella Base
Dimensions: 16L x 16W x 6H in.
(we don't sell Umbrella bases)

84" table has 3 legs

middle leg has a poly umbrella pole receptor

notice the horizontal predrilled 1/4" hole​

​84" table umbrella installation tips
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The ​84" table has 3 legs including 1 in the middle. You will not be able to use a regular umbrella base with this table.  You will notice a poly receptor for the bottom of the umbrella pole attached to the middle leg. Notice the horizontal predrilled hole. This is your guide to help you drill through your umbrella pole. Buy a 1/4" x 4" stainless steel bolt and nut at Home Depot to bolt your umbrella pole to the table base.
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We used to sell single color poly outdoor patio furniture. When we started putting black trim on our furniture it sold a lot faster.  It took us more than 1 year to get rid of our inventory built with 1 solid color because it just didn't look as nice.

The above 2 pictures may help you visualize how 2 Adirondack chairs can fit into smaller spaces such as hatchback vehicles and minivans.