Several ways. Every carrier and situation is different, so use your best judgement. There are a good number of anchor points.
- Under the chassis, on the frame rails are four ovalish funny shaped rubber plugs, one on the front of each frame rail and one towards the rear near the lift points. Just pop-out the rubber caps and a small hook fits in there firmly. This is the way the service manual advises, and on a stock car that isn't lowered it likely works great... I've myself have never used it as my own vehicle is just too low and too wide to get to them. The S2000 has them too. I suspect many owners have looked right at them and didn't even know what they were, but they are there in the service manual under tow procedure.
- There are two heavy ass hooks near the rear, one per side, just behind the rear tire area in the rear fender well area. You can't miss them they are held on by 3 bolts each. If you still have them on, you can use them in the rear depending on the anchor points on the flat bed.
- Given a stock front end, the front cap pops off the OEM front bumper and you can expose the OE front tow hook as well, which works well to get it on the carrier. It is best to put the NSX on front first anyway. A clearly marked front and rear aftermarket tow hook makes things a lot easier.
- Ideal would likely be a center locking wheel & nut with a hook, second best and what I often do is simply use tie down straps / baskets round each corner (wheels) plus use any exposed hooks. It works very well, and is very secure.
A few other points:
- Never use anything but a flat bed on a car you care about, most drivers automatically know this and the NSX is listed as flat bed only. Period. The front and rear dolley arrangement I've had problems with in the past on other cheaper cars despite assurances that it is just as safe, including leading to failed hub bearings, crunched under trays, and other issues associated with the method. Insist on a flat bed.
- As Larry just mentioned, never, ever, hook anything to the suspension members. For some reason many a driver has looked right at the rear lower aluminum A arms and implored me that it was ok and a great idea as they were accessible and exposed. I beg to differ and it's my way or the highway. Individual suspension members are not intended to be load bearing members for towing the entire vehicle. When securing your vehicle down, plan for the worse. Just imagine the flat bed emergency stopping or getting into an accident.
- Watch the wheels. Especially if your using 2X4's to assist in anyway. They tend to catch edges easy due to the low profile tires. Take your time. I've spent 45-60min prepping but you do what you have to.