The 'topRight' anchor function places the anchor of the link at the top-right corner of the view bbox. It accepts three arguments, which can be passed within the anchor.args property:

rotate	boolean	Should the anchor bbox rotate with the end view? Default is `false`, meaning that the unrotated bbox is used.
dx	number	Offset the anchor by `dx`. Default is `0`.
dx	string	Percentage strings (e.g. `'40%'`) are also accepted.
dy	number	Offset the anchor by `dy`. Default is `0`.
dy	string	Percentage strings (e.g. `'40%'`) are also accepted.

Example:

link.source(model, {
    anchor: {
        name: 'topRight',
        args: {
            rotate: true,
            dx: 10,
            dy: '40%'
        }
    }
});