Questions on the new Garmin Varia Radar 515/516

Trying to get a saddle mount for the Varia rtl 515 as I’m a short arses so my seat post is low. The radar work fine for cars but is picking up parked cars etc. Still gives me a piece of mind on the road as it still picks up cars just fine. Deffo think my mudguard is messing the radar up though as it needs mounted a bit higher. Come on somebody, make a good saddle mount for us short arses, lol.
Great product though, just way overpriced man.