I installed one quite similar to that in my rig. I bent the front mounting strip down instead of out, and cut a hole in stiff cardboard that just fit the shape of the inverter. I then used the cardboard template and cut through a thin panel that I could access through a large removable cover that gave access to the furnace and under the fridge, and built a shelf to screw the back tabs onto. Once I slid it into place, the front face and the front tabs stick out the hole just over flush, and the shelf and back tabs hold it perfectly. The main wires, if it's 1000 watt like it looks like (mine is only 400) should be connected to big leads near or directly onto the battery.
Mike
2012 Winnebago Impulse Silver 26QP
2005 16.6 Double Eagle
2018 Jeep Wrangler JK
previously Snowbird Campers,
Triple E Motorhome and Fifth Wheel