I'm not clear on what "backets" are (typo?), but setting up your monitor layout is only a two step process once your machines are all connected:

1. Select the correct configuration (1x2 for you, as I recall - I don't have MultiBox in front of me to confirm)

2. Select the computer names in the logical sequence (MainMachine in the left drop-down, DroneMachine on the right for you).

It really only gets a bit weird when you have stacked monitors, as I have.

Have you confirmed that the remote client has successfully connected to the server?

In what way does your setup not work?