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Congrats on the STiR, if I had to do it over, that's what I would gave gone with as well as the Laser Interceptor quad high-power heads or AntiLaser Priority with 5 heads (3 front, 2 back).
Old post, BUT if they're Escort ZR4 parking sensors, they are pretty worthless against today's (current) lidar guns. Since this post, Escort , Inc. did update the ZR4s to a new system call the Laser Shifter Pro (LSP for short). Much better than the ZR4s and comparable to the current LIs (Laser Interceptor), BUT if I were going for parking senors, I'd get the ALP (AntiLaser Priority).