The thing is although it feels recoilless, the action itself is actually moving a lot more than most conventional spring rifles....I've seen one piece mounts strongly recommended for these.
Obviously if it works out ok then all to the good, but if you start getting inexplicable POI changes then the mounts are the first thing I'd look at.
I may or may not buy a one piece when I go to pick mine up, I'll see what they have in stock.