Photon Server Pricing

Hi,

We are bit confused about the Photon Server pricing at

https://www.photonengine.com/en/onpremise/pricing

What is meant by Subscription Licence. Will exitgames also host the servers?

If we purchased a one-off Unlimited CCU license($3,500), do we need to pay extra for each instance we run for load balancing?

Is there any matrices, how many CCU a single Photon Server can handle for a simple board game (e.g. real time dice game)?

Please note that we are interested in Photon Server and not in Photon Cloud. As the game requirements need to validate the user moves. Thanks

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Regards,
Atif