What is your preferred approach for the management of choroidal oligometastases?

How do you decide between plaque brachytherapy and external beam approaches? What dose do you use for plaque brachytherapy? For external beam, what dose is likely to be effective while still minimizing risks? Do you prefer SBRT? Proton therapy? How do you minimize daily setup errors if treating with SBRT (what PTV margins do you use)?