WordPress Multisite Hosting For Developers and Agencies
Managing multisite on normal hosting is not easy,

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 being a developer I would suggest to use managed WordPress multisite hosting to show different demos on a single WordPress install, it will save your time and effort.

I have been using asvhost.com for this and so far have no issues. They provide me with really good service and uptime.
A wide screen just makes a bad film twice as bad.