I would say a pool triangle has 8 sides. 3 outside and 3 inside with 3 outside radius and 3 inside radius. You can also count the 3 dementional nature of it as having a top side and bottom side for a total of 8 sides.
The main thing i noticed was that it had what looked like “balls” on the bottom instead of the whole rack touching the cloth, similar to what can be seen on the V-rack ( https://www.thevrack.com/product/the-v-rack/ ).So how does the Predator version differ from other sturdy triangle racks?
I think all racks should be created with ball separators like this one.