Yes, it is possible to achieve this setup with WordPress multisite. You will need to set up the main site in the public folder and then create subsites with custom subdirectories (e.g. /r/site1) using the Network Admin > Sites > Add New option. Once the subsites are created, you can assign them unique URLs, such as https://hostrooster.com/r/site1 and https://hostrooster.com/r/site2. You may also need to configure your server settings or use a plugin such as WordPress MU Domain Mapping to map the subsite URLs to the correct directories.
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