For accurate pre-planning, download a copy of the user manual for the stove you are considering buying. It will list minimum clearances from the stove to surrounding combustible walls and sometimes a separate listing for minimum clearances to a protected wall (usually less than clearances to combustible walls). These minimum clearances must be met. If you want to move your stove closer than allowed by the minimum clearances to combustible walls, then the walls need to be protected with non-combustible surfaces. Methods for doing this are usually listed in the manual for the stove or in your local fire code. Keep in mind, the further from interior and exterior walls the stove is placed the better the heat distribution.