How about this?
(Actually a picture of the DEV-10305, replaced by DEV-10618 noted below.)
https://www.sparkfun.com/products/10618?
If so, I understand that I would have to double-up on the stackable headers to clear the MOSFETs.
What is that big long blue connector in the foreground or to the left near the 5V input? It looks like where you connect the outgoing AC power lines with screw terminals.
What is that Pins for the translucent white multi-pin connector with the multi colored wires coming out of it, at the other end or on the right.
Again, would I simply choose the pins that I want to use and assign them? Then, put in the 110V wires into the screw terminals?