I have a Furrion S wireless and it works great.
I use the suction cup mount inverted so it rests on the dash, with minimal obstruction through the window and I have a tire monitor as well.
Now I have a Bullet (Keystone) and the wires were crossed, took a few head scratches, but I flipped them around and WHAM, it works.
It's on the same circuit (power feed) as the running lights.
I like leaving it on while driving as well, when I first start out, or in traffic, it is expandable for side cameras if desired.
I have no complaints at all.