Based my install on this tutorial, I do suggest you find a fused insert for the box instead of the spade terminal and do try to use waterproof connectors wherever you can.
The way I mounted the strips was to a thin piece of plastic first and then zip tied into place. There are 3 mounting points on the passenger side using holes in brackets right above the carpet line and 3 on the driver by using the pedal module, hole bracket, and hood cable line to attach to (plenty of room above the feet on each side).
Recommend giving dymanicdiode's products a shot, as in my picture.