Although a number of manufacturers and third parties sell covers, the mowers that we sell in our robot shop are built to be outside with no cover during the season – the only recommendation is that the base is not in constant direct sunlight.
You may want to buy a robot mower garage/ kennel for security reasons or so that you can paint it the same colours as the surrounding buildings…that’s fine, just make sure that you buy one which suits your mower i.e. big enough and won’t get in the way of the mower. With RTK robots it is also important to ensure that the covers do not interfere with signals.
We would suggest installing the mower first and then thinking about the garage after you have seen it working.