Where to mount Navio2

I just received my navio2 and am excited to get building. I purchased a 450mm frame. Can I mount the navio2 / RPI in the center or does it need to go on the top plate? My concerns is interference but also think it will be more protected in the center of the frame (between top and bottom plates). Can anyone help me in understanding where do I need to mount? Since I am new at quads I was trying to protect it by not mounting it on top but also do not want to cause it to get interference.

Both locations sound good! There are no strict requirements about the placement.