That's part of the reason I went with R3s vs R7s - I could more easily rationalize having more than one at the lower price point. All my vehicles have BlendMounts and MirrorTaps installed, making it easy to always have (a measure of) "protection."my V1 was in my car, I was driving my truck. Now I take it with me no matter which vehicle I am in.
My wife, OTOH, finds detectors annoying and refuses to let me put one in her BMW, despite driving it with a lead foot.