Novel assemblies for use in conjunction with RF shielded enclosures and the like include one or more RF power and signal filters connectibly inserted, attached to, or otherwise made a part of optimized cavities or receptacles formed within an optimized frame of the assembly. The use of optimized cavities or receptacles greatly reduces the number of exterior fasteners needed to connect filters to the assembly or the assembly to an enclosure which, in turn, reduces leakage. The optimized cavities or receptacles may be arranged in a compact manner in order to make optimum use of the available space on an optimized frame of the assembly.