Looks like a regular ol' USB plug will do the honors, and the IVL saps power from the TV while sipping internet off of an Ethernet plug, so added cable clutter will be fairly minimal.

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Moreover, since it is a stateless device, you can unplug it from one Ethernet port, plug it back in somewhere else, and continue working.

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In brief, the physical installation simply involved plugging the AV cables (included) into the SlingBox and our set-top box (a Philips Freeview box, to be precise), then taping a couple of IR emitters onto the front of our set-top box, and finally hooking the SlingBox up to our router (via a couple of SlingLink ethernet wall-plug bridges as our router was too far away).

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