The ornamental design for a housingunit for a security and surveillance apparatus, as shown and described.
FIG. 1 is a front perspective view of a housing unit for a security and surveillance apparatus;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a left side elevation view thereof;
FIG. 4 is a right side elevation view thereof;
FIG. 5 is a back elevation view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines depict portions of a housing unit for a security and surveillance apparatus in which the design is embodied that form no part of the claimed design.