This paper presents a novel method using multiple combined compact antenna test ranges (CATR) to perform Radio Resource Management (RRM) measurements required for 5G devices capable of beam-forming in the millimeter wave frequency range. Four reflectors are arranged on a semi-circle centered at the device under test (DUT) which can be rotated by a positioner. This novel CATR system aims at creating four planar waves intersecting at the DUT location, thereby realizing five possible sets Angle of Arrival (AoA) pairs. These AoAs simulate spatially distributed base-stations, so as to evaluate 5G devices capabilities for execution of mobility procedures and radio link monitoring. Simulations and measurements, performed for both non-signaling and signaling scenarios, demonstrate the applicability of the approach for RRM measurements. Benefits in quiet zone size are highlighted, objectively establishing the superiority of the technique compared to traditional multi-probe setups without reflectors.