The Township Council may appoint up to two alternate members to the Zoning Board. Alternate members shall be designated at the time of appointment by the authority appointing them as "Alternate No. 1" and "Alternate No. 2." The terms of the members first appointed shall be so determined that to the greatest practicable extent, the expiration of such terms shall be distributed, in the case of alternate members, evenly over the first two years after their appointment; provided that the initial term of no alternate member shall exceed two years. Thereafter, the term of each alternate member shall be two years. No member may hold any elective office or position under the municipality. No member of the Board of Adjustment shall be permitted to act on any matter in which he has, either directly or indirectly, any personal or financial interest. A member may, after public hearing if he requests it, be removed by the governing body for cause. A vacancy occurring otherwise than by expiration of term shall be filed for the unexpired term only.