[Closed] Retrofit (DIY) parking sensors, but Front and Back.

I've fitted a couple of rear Dolphin kits over the years (a brand I'd try and go for again) BUT my wife now informs me we need them front and back for the latest estate.

So can anyone recommend a half decent F+R kit - like the factory fitted ones where the front only works for a short while / distance? Or is there and easy way of fitting 2 individual ones (eg the Dolphins) but the front on a timer / triggered by the rear. Or am I being daft?

Oh - and it is kind of bike related: its for carrying bikes!