Got my HDS 7 Gen 2 mounted on the bow over the weekend. I used the power feed under the tray and it has been working fine. It was also super easy to fish the ethernet cable to the console. Attached are a couple of pics one of us testing the power while the tray is still out (you can see the power harness) and another right before putting tool/drink holder back in tray.
I used the 4 inch angled mount from Bass Boat Technologies.