Ability is a desk based workstation system by Teknion. Fortunately a big part of their strategy with Ability involves mobile tables. They have many shapes and sizes of tops for the mobile part of the line, but many are designated for other uses, and are shaped to facilitate those other functions. Its their "work" tables that are most desk like, and hence most useful if you are setting up a vertical desk.
This rectangle has rounded ends. They also make one with straight ends.
This top has an interesting shape, perhaps very good for pulling up to the vertical desk.