If i had a bass remote installed which i need to do.. I would try to mount it in between the seat and middle console, on the driver side of console, near the shifter area. so it would be easily turned up or down while driving..
I wouldnt see why that would be a problem. I have also seen switches and other things there so there is obviously enough room for something. Will you be buying a bass knob or building it yourself? I built my own. It was a little larger than the other ones but I spent about $5 in parts.
Also, will you be grinding down the picture on that plate? A knob right in the middle of it would look a little off IMO.