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Oak floating shelves

I have an alcove that is 2m wide and would like some floating shelves inserted in there. We have a wall mounted tv already there, so would like two shelves below that full depth which is 200cm width x 45cm depth. Above the tv 2 shelves that are 100cm width x 25cm depth. Photo below shows something similar with regards to how want the top shelves set out, not needing the edges inserted.