I forgot to mention...

Using an advanced controller, such as the Crestron or AMX, would enable other features, like "source pooling".

If you will never actually be watching 8 different DSS channels simultaneously (unlikely), you could get by with fewer receivers -- maybe four or five. With "source pooling", you would have a single "DSS" button on the keypad or remote, and when pressed, the control system would automatically select an available satellite receiver which wasn't already in use. No need to have a separate receiver for each room, and no need for several buttons on the keypad (DSS1, DSS2, etc).

In addition to lowering the number of receivers required, it also reduces the amount of source inputs that need to be switched (or frees them up for other devices) and requires fewer discrete IR outputs.

Depending on your application, it might be useful...