We used a 49er track (which I believe is the same as a RS800 track) on both Atum and Antidote. They were both secured in three places only. It can be stood on without incident.
We had seen the 29er style ones fail in the past, so went for a big and pretty heavy one.
Atum: Short (25mm) lengths of tiller epoxied and carboned to the gunwhales which were a tight fit for the track to go through did the ends. The middle was a carbon plate carboned to the stump to which the centre of the track was bolted.
Antidote: Big flat carbon plates sticking up from the gunwhale and the track trimmed to be a snug fit between them. Bolts went inwards down the centre of the track and nuts was placed in the outboard most holes which allowed it to be attached. Centre was done with a plat attached to the bridgedeck part I think.