Most skid plates leave the front tie down loops exposed. If yours aren't I would cut access holes. My splitter hid the loops but I removed the bumper and splitter to load the car onto the trailer anyway so I just left it off.
Please please please do not use the lateral links in the rear. Throw an axle strap around the cast portion of the knuckle that the trailing arm mounts to. Or use the rear tie down loops in the chassis.
In a pinch you can strap through the wheels. This is a quick way to tweak the alignment of the car though, especially if the straps are angled, which they should always be (in order to control fore-aft movement and side-side movement).
Over the tire straps work well, however using them on cars with low clearance sucks and you need etrack set at the track width of the car.