(a) After letters of guardianship of the estate are granted, the court, for good cause shown, on the court's own motion or the motion of any interested person, shall appoint at least one but not more than three disinterested persons who are residents of the county in which the letters were granted to appraise the ward's property.
(b) If the court makes an appointment under Subsection (a) and part of the estate is located in a county other than the county in which the letters were granted, the court, if the court considers it necessary, may appoint at least one but not more than three disinterested persons who are residents of the county in which the relevant part of the estate is located to appraise the estate property located in that county.