Marble with underfloor heating on suspended floor

[MFaisal]

Hello,

I am looking for advice. I am intended to lay Marble stone with wet underfloor heating in my living room and hallway. I have suspended floor with 100mm joist. What could be the best possible and cost-effective way to get the right solution.
I have planned to put the 50mm PIR between the joist, but I am confused about how to lay the pipe and tile the floor. If someone has experience advice, please let me know.

Thanks
Regards