Casting over EPS cement with which material?

[klister]

I will be laying EPS-cement in our bathroom, but I can't decide what to use when casting over it. I'll have 11mm piping for the underfloor heating. I have been considering Finja Bemix P3. But how thick does it need to be with the piping for underfloor heating? Should it be reinforced? Are there better options? Fiber-reinforced self-leveling compound?

 

[ByggPutte]

Can't find info about bemix3?
It usually says on the bag or info sheet how thick you need to lay it.
There was some information on finja.se.

Best regards, Putte