On your MH, that hole for the antenna cable feeds down into the space between the left interior wall of the cabinet over the dinette and the outer sidewall of the cabinet. You have to pull that interior panel to access the space (that's where your coaxial splitter happens to live).
I bought a Mini back in early December when it was still on their Black Friday pricing. Bought it through Home Depot and scored an extra 10% military discount. Tossed the unit in its unopened box under the bed for our two month trip down to Florida, "just in case" we needed it. Got by without it using an AT&T hotspot only. At least I'll have it for our future trip to Alaska where cell service will be somewhere between zero and spotty outside of the towns. I plan on just putting it on the dash in front of the window unless I find a spot where I need to move it outside to get a good enough view of the sky. Half tempted to see if I can put it inside the forward roof vent and just string the cable across the ceiling to the "AV cabinet".