I have the same trailer (although it's in its storage spot right now, so I can't check for you in real time)
The fireplace in my 2019 is a Greystone. It looks like they put both a flat front and a radiused front model in that trailer (whatever they had on a given day, I guess.)
They look to be either 26" or 28", from the info I see. With either of them, there's sufficient room before you hit the electrical outlet on the left, or the stereo above.
If you have the bottom section of your pantry blocked off, opening that up will give you a LOT more storage room. Early build 2019 trailers had the fireplace, but they blocked off the entire area behind the fireplace. The place I bought mine from had one of each; that's how I know.
As far as wiring... at the factory, they put a wall switch next to the main control panel by the door - it toggles between the fireplace or the microwave.
You don't have to do it the same way, of course.