It’s easy to check whether your multisite will work on Pressable.
First, go to My Sites -> Network Admin -> Sites in the top-left menu.
Here, you will see your site and subsites.
Path-based Network (Subdirectories)
If your sites begin with the same domain but end differently (with a different directory), you have a subdirectory multisite. This configuration is functional on Pressable.
Domain-based Network (Subdomains, Domains)
However, if your sites include subdomains or different domains, this configuration is not currently supported by Pressable.
For more information on creating a WordPress multisite network, see this guide from WordPress.org.