At 0.7W you'll need some heatsinking really - otherwise they will run rather hot. Its just easier to keep things simple if possible. Small clip-on heatsinks (or a little fan) would be enough at 0.7W I think. However if the load is only intermittent for short periods maybe the heatsinking isn't necessary - personally I'd pick a 0.01ohm device and not even think about thermal issues.
To run at the 96W maximum you would need to mount on a water-cooled copper slab - no one goes anywhere need that limit if they don't have to!