No one knows WordPress multisite better than we do! Maintainn provides dependable and knowledgeable support for Enterprise Support clients with multiple websites on one installation. Maintaining and supporting a WordPress multisite is complex, yes, but we have the expertise to do it easily.
Typical pricing for this add-on starts at $100/month ($83/month for yearly subscriptions.) Final pricing can be determined after an evaluation of your multisite. Feel free to reach out through our contact form for a free evaluation and pricing for your website.