CBC_AMAZON usage

So I want to display an Amazon link for a product that directs to the appropriate country.

I thought that by doing something like
[CBC_AMAZON asin="0470877014" country="us,uk"]WordPress for Dummies in the US[/CBC_AMAZON]
would allow that to work. However it’s only showing the US link.

If I break that up into 2 separate shortcodes (one for US and one for UK) then I get both links displayed, which I don’t want.

Am I doing something wrong in the first shortcode, or am I supposed to wrap the [CBC] around it like:

[CBC show="y" country="us"]
[CBC_AMAZON asin="0470877014" country="us"]WordPress for Dummies in the US[/CBC_AMAZON]
[/CBC]
[CBC show="y" country="uk"]
[CBC_AMAZON asin="0470877014" country="uk"]WordPress for Dummies in the US[/CBC_AMAZON]
[/CBC]

https://wordpress.org/plugins/custom-content-by-country/