Can I have x2 GL Mango routers in same house?

Wonder if you can help. I’ve been using a Gl Mango mini wifi router for the last year which has been fab. I’ve recently needed internet i another part of my home which I would just unplug the mango and move to the other end of the house. I live in a very rural area and the walls of the cottage are very thick. As I now need to be able to use the internet upstairs and downstairs at the other end of the house I thought easiest option would be to purchase a 2 nd mango mini, which I have and wanted one upstairs and one downstairs at the other end of the house. I cant get both of them to work, and I really don’t want to keep having to move just one of them. Can someone help me please? Im not at all technical!

Where is the original one getting its internet from?

Did you set the 2nd one up in the same way?