I know I was surprised the armpad did not come standard from the start. My CT was the top of line that came with leather, navigation, radar cruise control, PCS, illuminated door sills, LED headlights, etc...
I did not use double-sided tape. I took the center console apart and underneath there are markers where to drill the holes and it comes with the bolts and plastic fastener. Overall it was very fast, fun and easy. It took me about maybe 15 minutes if that.