Levelling compound behind stove?

This is my first post!

I've opened a can of worms. I have an Art Deco fireplace in my house with the old backsy fire in place. I decided to renovate it so I'd be preserving the original feature so I bought an old original Godin Stove to sit on a bespoke hearth in front of the fireplace. To bring the concrete hearth up to the level of the floorboards (now that I've removed the backsy), can I simply use a standard Self levelling floor compound, bond my marble hearth on top of this (after its set) and then fill the space behind the hearth with the same compound to make sure the fireplace aperture floor level is the same as the hearth level???

So I guess the questions are: is a standard self levelling compound able to stand the heat of a stove and can I pour a layer over an (already set) layer?

So sorry it's hard to describe.

 

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