Yes I read the post on rubber mounts and see what you are talking about. I would think that with rubber tape only 1/32 thick and fused to the frame and motor mount, would not allow for any movement at all, unlike thicker mount types, IE: rubber bike tubes, sheets of rubber, or skate board mounts that allow movement of the motor to frame.
this tape is used to seal water leaks in pipes under pressure and has to seal to the pipe and itself the outside of the tape will also seal to whatever is put onto it.
If I do try it I will make sure the motor will not move and check when the motor is running under load as well, if the motor moves I then will remove it and put motor to frame. It would be nice to emanate as much vibration as possible.