How do I configure an additional ip?

Hi,

I have a VPS in OVH, with his ip: AAA.AAA.AAA.AAA
That ip is in France, and I want my web looks like a spanish site (to improve my SEO), for this reason I bought an additional geo ip in spain: BBB.BBB.BBB.BBB

How can I configure it for a right use?
I add it with this method: https://docs.ovh.com/gb/en/dedicated/network-ipaliasing/

But now, I dont know what ip I have to use in the field "Shared IP", "nameservers", "hostname" ...   

In my domain provider I have some glue records.

fr1.domain.com  AAA.AAA.AAA.AAA
fr2.domain.com  AAA.AAA.AAA.AAA
es1.domain.com BBB.BBB.BBB.BBB
es2.domain.com BBB.BBB.BBB.BBB
server.domain.com AAA.AAA.AAA.AAA

Finally I have used BBB.BBB.BBB.BBB in all fields and I think it is working 

And nameserver:

es1.domain.com   BBB.BBB.BBB.BBB
es1.domain.com   BBB.BBB.BBB.BBB