What Is a Good Controller To Hook Up 4 50" Displays To For a Nice Wow?

While a bit off topic, I believe probably a lot low voltage people may deal with this. A customer asked me to put together a display for him that will consist of 4 50 inch screens with no bezel. He wants it to be as one big screen. He is looking for something that will let him easily change what is displayed on them. To use his words "like times square".

Do you have any suggestions as to what can be used as the controller?

Thank you

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