Active job

Tiled corner hearth for new fireplace

We are installing a fireplace in the corner pictured and are looking into a tiled hearth (underneath the fire, not behind it). The fireplace is the Woodsman Serenity 16kW and the hearth recommendations are attached, although we'd like to go slightly bigger than this if possible. We picture it slightly raised but we're flexible on the details. We have some tiles left over from the build and we'd like to use these if possible (we have 10 and we're not sure if that will be enough or if they're suitable). They are "Silk Nero" from Tile Warehouse and measure 600x300mm. Timeframe within 6 weeks.