Rent and activate Minecraft Bedrock Server?

I want to rent a small server for the Bedrock edition together with a buddy because we both play on an Xbox one s. We have already tried realms, but the extremely low visibility makes it difficult for us and we have had less and less desire to play. Now, for example, we want to rent a server from Nitrado, which is no problem at first. We would upload our existing world there and then put the server online. However, there's no function on Xbox how to add your own server. Can someone explain to us how to do that? And if you find a good provider for little money and at least 2 slots, we would also be grateful, because we just want a higher visibility.

https://aternos.org/...os.org/en/

the site says it does free server on java and bedrock edition (i got it for java and the server is good too)

hope could help ^^