Underlayment for tile hearth beneath Woodstock Cottage Franklin soapstone gas stove

[francesstoves]

I'm building a new house that's a concrete slab foundation. I'm putting in a Woodstock Cottage Franklin Soapstone Gas Stove in the living room. I need to install a hearth of porcelain tile that's 3 ft by 3 ft for the stove to sit on top of. Currently, there is no subfloor ... there is just the concrete of the foundation itself. What is the best underlayment for the tiles of the hearth? Would Schluter®-DITRA-HEAT work?

Thank you!