you can flat mount them to the chassis
you will need spacers on the underside so that you dont run out of thread
down side of the flat mount to the chassis is you cant get the wiring through for the attessa, you need to massage anout 4 mm of a little corner of the chassi, its very tight on the rear attessa lines, you need to dick around with the hand brake cable as the 2 inches makes a diffrence and it shall be noisy as fcuk