Santa Cruz Tallboy - 2 bottles?

[Mattman]

Very specific question but has anyone managed to get 2 water bottles on a Santa Cruz tallboy using the holy rail? If so, which model and size bike? Looking at upgrading but really feel like getting 2 bottles on a bike is a minimum criteria when spending many ZARs. Lyne website says “not compatible use 500mm rail” so not quite sure what that means? I’m secretly hoping there is a way to do it as I like the bike. 
(and yes one can use a hydration pack but I far prefer not riding with one)

[ichnusa]

Which Tallboy is it and what size?