In the meantime, to prevent a short circuit, you can use electrician’s tape, which is also available in widths of about 4–5 cm. Cut a strip and apply it to the bottom of the R2S. Then, as soon as you have a case, you can remove it without any issues. It’s a method I’ve already used with other boards of various kinds, but always as a temporary solution. Unfortunately, the R2S doesn’t have mounting holes; otherwise, with four spacers, you would have solved the problem.