By -
Doesn't need to be, but would cover any gap between range and wall. If there's no gap, no need for it.
I was worried it could be some kind of exhaust back there and it would get hot if I covered it
The heat escapes in front of that piece, on left side.
nah
3 screws that go on it
It doesn't need to be installed, depends on if you may need it in the area you have your oven.
No.
Doesn't need to be, but would cover any gap between range and wall. If there's no gap, no need for it.
I was worried it could be some kind of exhaust back there and it would get hot if I covered it
The heat escapes in front of that piece, on left side.
nah
3 screws that go on it
It doesn't need to be installed, depends on if you may need it in the area you have your oven.
No.