Best way to round bottom corners on rounded devices.

So the homepage on non rounded devices looks like this:

In rounded corners devices instead it looks like this:

Probably the best looking way would be round botton corners only on round devices but I don't know if it's possible to detect when a device have rounded corners or not on xamarin. (Or else you just suggest to add some margin?)

Also how can I round just left or right border of a stacklayout?

Thanks