If you plan on using Ethernet for the clock connectivity, one issue is that the way the Pi is oriented on the back of the clock board, it's awkward to plug in a normal OTG adapter cable, since it exits down towards the bottom of the clock.

The solution is one of these I found on Amazon:

It's a right-angle OTG adapter cable. This one is particularly nice because it turns to the left, which means that it doesn't block the power port, if you need/want to use it (of course, you'd want a micro-usb cable that was right angle the opposite way for that one).