Align visual within box

I'd like to customise where the visual appears in it's box. For example, by default the matrix visualisation appears in the top left of the box and will expand down/right. to take up more of the visualisation space. I think it would be good to have an option of where you want to place the visual within its box like you do on text boxes in Excel. E.g. dead centre, centre top, centre left, bottom right, etc. This way I can place a table knowing it will always be stuck to the right edge of where I place it and it will expand over the the left.